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Old 04-16-2006, 09:49 AM   #1
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true duals

Im thinking about getting true dual exhaust on my S10. I would like to get borla exhaust and magnaflow hi flow catalytic converters. Would putting true duals give me better performance and sound? I want to get true duals if i would do modifications down the road like headers which im thinking about doing next year and get some more money. Would getting true duals put on an S10 be to difficult with the oxygen sensors and would it still run good?
Also are the magnaflow hi flow cats street legal? i live in PA
Thanks
Old 04-16-2006, 03:05 PM   #2
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Re: true duals

Edit: Or would i just be better off getting a cat back system and a Magnaflow high flow cat. After searching the forums it doesnt look like true duals work out to good on S10's.
And does anyone know if the hi flow cats are street legal? it doesnt say they arent so id assume there are legal just want to make sure though, also should i invest in a new Y pipe?

Thanks for the help
Old 04-17-2006, 12:55 AM   #3
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Re: true duals

Yeah hi-flow cats are legal, and no true duals dont work very well on a v6.
Old 04-17-2006, 11:44 PM   #4
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Re: true duals

i have true duals on my truck with turbo mufflers(just ordered some flowmasters tonight) and i think it sounds pretty good. i have a sound clip if you want to hear it
Old 04-18-2006, 12:58 PM   #5
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Re: true duals

Who says high-flow cats are illegal?
Old 04-18-2006, 01:13 PM   #6
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Re: true duals

It'll perform just as well as a properly setup single exhaust, just costs you more.

And..who the hell needs a cat anyways???!!?
Old 09-10-2006, 09:29 PM   #7
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Re: true duals

I'm afraid to pull the cat and have to stare at a check engine light because of 02 sensors.
Old 09-10-2006, 10:24 PM   #8
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Re: true duals

Get an o2 simulator
Old 09-11-2006, 12:12 AM   #9
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Re: true duals

i would keep the cat. unless you have 500+ hp. a "high flow" or gutted cat. should be one of the last things you think about doing as a mod. unless its clogged. spend the money a custom y-pipe or cat-back exhaust. in my opinion, i don`t know why people say to remove or gut the cat as one of the first mods. later on down the road, yes. have you seen the stock muffler on our trucks, yeah that should be taken care of first. again this is my opinion and i don`t mean to offend anyone. to each to his own.
Old 09-11-2006, 12:24 PM   #10
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Re: true duals

I completely removed my cat and didn't gain any performance from it. So I would keep the cat you have now unless it's clogged. I would however recommend a good custom y-pipe and cat back single exhaust. True duals are difficult and costly to setup because of the limited space and gas tank location plus your ride won't perform any better than it would with a good single exhaust setup. Everyone has their own preferences but I chose the cheaper route and installed a 2.5" Dynomax catback system from summit for $110 and I'm quite pleased. Now I just need a custom y-pipe. PS the factory cats are high flow and work just fine, wish I would have kept mine.
Old 09-11-2006, 06:19 PM   #11
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Re: true duals

Quote: Originally Posted by wotgtp
i would keep the cat. unless you have 500+ hp.
i disagree. where did you come up with that number from? gutting your cat gives you better flow and gives the exhaust a different tone. shit my truck doesnt make 1/2 of that and i noticed a difference. even the guys on performancetrucks.net with fullsize (less than 500+ hp) trucks usually have theirs gutted or go high flow.
Old 09-11-2006, 09:29 PM   #12
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Re: true duals

I would just get a highflow cat and a single 2.5 exhaust. A highflow cat wont hurt your exhaust flow any.
Old 09-12-2006, 12:31 PM   #13
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Re: true duals

I HAVE TRUE DUALS

jba headers the pipes are ran right up to the tranx xmember then in to the magna flow cat then to the 40 flows. I ditched my stock tank a long time ago. and to run my pipes it was 100 bux out the door
Old 09-12-2006, 12:52 PM   #14
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Re: true duals

I'm not convinced that gutting your cat is giong to give you any real performance boost. That would have to be proven with some dyno runs with the cat and w/o the cat and some runs at the track to see if there was any real difference. Most people who gut their cats or replace them with a straight pipe do so when they install a catback exhaust system. So is the performance gain from the gutted cat or from the betterflowing catback system. I did the catback first and noticed a performance gain then pulled the cat and substituted a straight pipe and felt no gain but I did hear a difference in the exhaust tone. Made mine sound a little more ricer in my opinion. Wish I would have kept the cat. To each there own.
It would be interesting to see some real dyno data numbers with and without the cat and with and without the catback system. Everyone has their own opinions but hard numbers...that's what I'm talking about. So whose got the cash and the time to do our experiment and give us some real answers?
Quote: Originally Posted by blk_blazer
i disagree. where did you come up with that number from? gutting your cat gives you better flow and gives the exhaust a different tone. shit my truck doesnt make 1/2 of that and i noticed a difference. even the guys on performancetrucks.net with fullsize (less than 500+ hp) trucks usually have theirs gutted or go high flow.
Old 09-12-2006, 02:44 PM   #15
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Re: true duals

Quote: Originally Posted by sockjock
I'm not convinced that gutting your cat is giong to give you any real performance boost. That would have to be proven with some dyno runs with the cat and w/o the cat and some runs at the track to see if there was any real difference. Most people who gut their cats or replace them with a straight pipe do so when they install a catback exhaust system. So is the performance gain from the gutted cat or from the betterflowing catback system. I did the catback first and noticed a performance gain then pulled the cat and substituted a straight pipe and felt no gain but I did hear a difference in the exhaust tone. Made mine sound a little more ricer in my opinion. Wish I would have kept the cat. To each there own.
It would be interesting to see some real dyno data numbers with and without the cat and with and without the catback system. Everyone has their own opinions but hard numbers...that's what I'm talking about. So whose got the cash and the time to do our experiment and give us some real answers?
I heard from one of my buddies that some mag did a before and after dyno run of a stock civic with removing the cat. He said it made not even 2 hp of a difference. hell that hp increase could have been from the air temp changing. granted this is a stock civic and is obviously different from a s10 or anything else. oh and i said "i would keep the cat. unless you have 500+ hp" because i pulled that number out of my ass. a reasonable number would be 300 or more then you may get a slight gain. unless someone can prove otherwise
Old 09-12-2006, 04:59 PM   #16
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Re: true duals

most of the cats on newer vehicles are already a better flowing style
Old 09-12-2006, 08:15 PM   #17
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Re: true duals

Dont run a cat...Never will. Sounds a whole hell of a lot better, and I know it flows better. Hell, there is nothing on my truck but 3" straight pipe from the Y back, and 3" straight through the muffler. And I know I make more than 300rwhp on the bottle

Even if it only gave 2-3hp its worth it to me. Damn you tree hugging hippies
Old 09-12-2006, 09:06 PM   #18
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Re: true duals

Quote: Originally Posted by 1fast4by
Dont run a cat...Never will. Sounds a whole hell of a lot better, and I know it flows better. Hell, there is nothing on my truck but 3" straight pipe from the Y back, and 3" straight through the muffler. And I know I make more than 300rwhp on the bottle

Even if it only gave 2-3hp its worth it to me. Damn you tree hugging hippies
LOL I tend to agree completely, but unfortunately some of us (including me now in the State of Massachusetts) need to retain a cat in order to pass safety/emission inspection . I was able to pass without a cat currently in Mass, but I know I will not be able to find an exhaust shop to build me a manifold-back exhaust system without putting a cat on there.
Old 09-13-2006, 01:26 AM   #19
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Re: true duals

Quote: Originally Posted by 1fast4by
Dont run a cat...Never will. Sounds a whole hell of a lot better, and I know it flows better. Hell, there is nothing on my truck but 3" straight pipe from the Y back, and 3" straight through the muffler. And I know I make more than 300rwhp on the bottle

Even if it only gave 2-3hp its worth it to me. Damn you tree hugging hippies
I like your style.. I ran 3" from my y-pipe back (NO CAT .. CATS ARE BULLSHIT) and into a flowmaster (i know flowmaster = trash but its what I had) and i ran a 14.8 with that exhaust and a little timing being my ONLY mod
Old 09-13-2006, 02:07 AM   #20
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Re: true duals

I wouldn't know, I'm not putting cats on my truck once the V8 is running. Of course, there's no other emissions equipment on it, either.
Old 09-13-2006, 04:17 PM   #21
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Re: true duals

Quote: Originally Posted by MINTSICK
LOL I tend to agree completely, but unfortunately some of us (including me now in the State of Massachusetts) need to retain a cat in order to pass safety/emission inspection . I was able to pass without a cat currently in Mass, but I know I will not be able to find an exhaust shop to build me a manifold-back exhaust system without putting a cat on there.
You are wrong. Because Brad would probably do your exhaust without a cat you just wouldn't be able to say who did it if you got pulled over the cop checked to see if you had a cat on there. He doesn't care as long as he gets paid. I am pretty sure he would do whatever you want him to do.
Old 09-13-2006, 06:20 PM   #22
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Re: true duals

Quote: Originally Posted by Dan Plante
You are wrong. Because Brad would probably do your exhaust without a cat you just wouldn't be able to say who did it if you got pulled over the cop checked to see if you had a cat on there. He doesn't care as long as he gets paid. I am pretty sure he would do whatever you want him to do.
Well well well, very interesting information.
Old 09-14-2006, 08:40 AM   #23
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Re: true duals

Quote: Originally Posted by 1fast4by
Dont run a cat...Never will. Sounds a whole hell of a lot better, and I know it flows better. Hell, there is nothing on my truck but 3" straight pipe from the Y back, and 3" straight through the muffler. And I know I make more than 300rwhp on the bottle

Even if it only gave 2-3hp its worth it to me. Damn you tree hugging hippies
tree hugger??? .... hardly. hippie? ...never...
sure, when i was younger, i ripped the cats off everything i had.
but that was back when cats were far more restrictive than they are today.
and leaded fuel was cheaper than unleaded, and cat failures were far more common...

now, im older and smarter, cats flow far better and cost almost nothing in power,
and leaded pump fuel is little more than a distant memory.
oh, and dont forget emission inspections.... which are getting more widespread just about by every day....

plus, theres no denying the fact that cats are by far the single most effective automotive emission control device ever created....

sorry to say it, but you "anit-cat" guys really have no rational logic behind your point of view....
Old 09-14-2006, 08:58 AM   #24
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Re: true duals

Quote: Originally Posted by MINTSICK
Well well well, very interesting information.
Yeah Mike just give him a call and ask him if he will do it. I am sure he will.
Old 09-14-2006, 01:20 PM   #25
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Re: true duals

Quote: Originally Posted by Dan Plante
Yeah Mike just give him a call and ask him if he will do it. I am sure he will.
Don't have the money for exhaust right now plus I need to fix my valve seals before I throw a cat on there, the days of no cat are coming to an end I'm tired of the gas smell associated with running no cat.
Old 09-14-2006, 02:07 PM   #26
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Re: true duals

I hear ya there. Whenever you get the $$ for the exhaust just let me know and I will show you where to drop the truck off.
Old 09-14-2006, 10:53 PM   #27
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Re: true duals

Quote: Originally Posted by Crew Cab Sonoma
tree hugger??? .... hardly. hippie? ...never...
sure, when i was younger, i ripped the cats off everything i had.
but that was back when cats were far more restrictive than they are today.
and leaded fuel was cheaper than unleaded, and cat failures were far more common...

now, im older and smarter, cats flow far better and cost almost nothing in power,
and leaded pump fuel is little more than a distant memory.
oh, and dont forget emission inspections.... which are getting more widespread just about by every day....

plus, theres no denying the fact that cats are by far the single most effective automotive emission control device ever created....

sorry to say it, but you "anit-cat" guys really have no rational logic behind your point of view....
could not have said it better. with emissions, and the advancements cats. have gone under, there not THAT MUCH of a horsepower loss. but unless you run leaded race gas or have alot of power(maybe 300 crank hp or more). then take it off. people with just intakes and gutted cats., come`on now, can you feel the 1hp difference without it?
Old 09-15-2006, 09:03 PM   #28
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Re: true duals

Quote: Originally Posted by Crew Cab Sonoma
tree hugger??? .... hardly. hippie? ...never...
sure, when i was younger, i ripped the cats off everything i had.
but that was back when cats were far more restrictive than they are today.
and leaded fuel was cheaper than unleaded, and cat failures were far more common...

now, im older and smarter, cats flow far better and cost almost nothing in power,
and leaded pump fuel is little more than a distant memory.
oh, and dont forget emission inspections.... which are getting more widespread just about by every day....

plus, theres no denying the fact that cats are by far the single most effective automotive emission control device ever created....

sorry to say it, but you "anit-cat" guys really have no rational logic behind your point of view....
Finally someone with some reason.
Old 09-15-2006, 09:56 PM   #29
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Re: true duals

Yeah, I left mine off when I did the header install b/c I butchered up the flange bolts coming from the cat w/ a Sawzall while pulling off the old headers. I wasn't expecting to not be able to re-use the cat, and I was flat broke and s.o.l., so I just welded up a pipe in it's place.

I haven't noticed any difference in performance, and it smells awful at times, especially when one of my O2's went bad last week and the truck began to run very rich. I'll be at the exhaust shop tommorow afternoon, finally getting a new one one.

Just keep the cat on, fellas.
Old 09-15-2006, 10:07 PM   #30
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Re: true duals

Just keep the cat, like mentioned above.

Just say you took it off so you still sound cool to your out-dated performance friends.
Old 09-16-2006, 11:25 PM   #31
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Re: true duals

Quote: Originally Posted by Crew Cab Sonoma
tree hugger??? .... hardly. hippie? ...never...
sure, when i was younger, i ripped the cats off everything i had.
but that was back when cats were far more restrictive than they are today.
and leaded fuel was cheaper than unleaded, and cat failures were far more common...

now, im older and smarter, cats flow far better and cost almost nothing in power,
and leaded pump fuel is little more than a distant memory.
oh, and dont forget emission inspections.... which are getting more widespread just about by every day....

plus, theres no denying the fact that cats are by far the single most effective automotive emission control device ever created....

sorry to say it, but you "anit-cat" guys really have no rational logic behind your point of view....


In fact heres a fun one for you, I dynoed a 500hp engine with and without cats, difference was 4hp. They were dual dynatech high flow cats..
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