Cat or nay

crywolf · 07-02-2008, 08:08 PM

Just wondering if not running a cat on my 98 4.3 s10 will cause any major problems or not. Other than the legality issue is there any other major reason why I couldn't just ditch the cat? It's rattling like crazy and I'd rather just get rid of it. Thanks for the help!!

greencactus3 · 07-02-2008, 08:39 PM

cel light.
no major problems

crywolf · 07-02-2008, 08:47 PM

Well.. I'm a stingy bastid and I could live with a cel if I didn't have to pay for a new catty...haha

greencactus3 · 07-02-2008, 09:01 PM

$60 for a new cat... id say its worth it...

Solid10 · 07-03-2008, 07:50 AM

i have a 93 and i welded some pipe where my cat was.

never want a cat again!
and i didn't get a CE light-my O2 sensor is BEFORE my cat in the stock exhaust system

greencactus3 · 07-03-2008, 12:16 PM

Quote: Originally Posted by Solid10

i have a 93 and i welded some pipe where my cat was.

never want a cat again!
and i didn't get a CE light-my O2 sensor is BEFORE my cat in the stock exhaust system

yea, pre obd2 isnt it?

crywolf · 07-03-2008, 12:55 PM

Anyone know what the stock exhaust pipe size is on the 4.3?

Solid10 · 07-03-2008, 01:12 PM

Yes i have OBDI.

and i have no idea crywolf, last time i saw my stock pipes i was 14 :-\

truefire04 · 07-03-2008, 03:36 PM

well i gutted the cat on my v6 when i had it, the ces light came on got a new o2 sensor and got some sparkplug arestors drilled 1 out, and left the other alone put them together and put them in the exhaust and put the o2 sensor in and as i was driving down the rd. the ces light when off.pipe size is 2 1/4.

MINTSICK · 07-03-2008, 07:32 PM

CEL and won't be able to pass emissions (if you have these in your area) with the CEL triggered (o2 simulator, editing the post cat o2 out with a PCM tune, spacing the o2 sensor, etc can fix the CEL issue). IMO I have done both and after finally ending up with a high flow cat on my last system I would never bother not running a cat on an obdII vehicle again. A quality high flow cat honestly produced the same sound as running no cat did for me but without the eye burning raw fuel fumes/smell.

snoplow · 07-04-2008, 07:48 AM

i think mine was 2 1/2 outside but im not sure sut it out measure it at the od dimesion and go to ur local store and get that same size but in id and slip it on and weld it up i did i love the sound u get and no cat rattle

crywolf · 07-05-2008, 02:57 PM

Ok thanks for the help everyone! So it sounds like the stock pipe is 2.5" o.d.?

chevyrules05 · 07-06-2008, 12:53 AM

2.5 inch and if you take your cat off you will loose mpg

Nario · 07-06-2008, 06:17 PM

I'm calling bs on the loss of mpg. Im getting 20 mpg without a cat.

Solid10 · 07-07-2008, 07:51 AM

Quote: Originally Posted by chevyrules05

2.5 inch and if you take your cat off you will loose mpg

taking a cat off helps your exhaust flow better.

meaning-your truck can shit better, so now it can eat better.
what makes you think it hurts mpg

Solid10 · 07-07-2008, 07:52 AM

well, i guess it depends on where your sensor is. Mine was before the cat, so it still reads the same thing as if the cat was still there.
And i took off my magnaflow "high flow" cat...yeah right, that thing was some kind of gimmick my truck was much more toned after i tossed it

MINTSICK · 07-07-2008, 11:42 AM

There is no mpg loss from not running a cat converter, period. Sound output between no cat and a high flow cat is debatable, like I mentioned before I went from no cat to a Spintech High Flow and noticed no difference in tone.

Solid10 · 07-07-2008, 12:55 PM

maybe it was just my magnaflow.

2002dime · 07-08-2008, 01:03 PM

There is a huge difference in sound from no cat to having a cat along with my magnaflow 40 series. I have a obdII model with a straight pipe, and have yet to throw a ECM code.

MINTSICK · 07-08-2008, 04:37 PM

Quote: Originally Posted by 2002dime

There is a huge difference in sound from no cat to having a cat along with my magnaflow 40 series. I have a obdII model with a straight pipe, and have yet to throw a ECM code.

I said between a high flow cat and no cat, there was a noticeable difference with a stock cat. Either way nowadays there is really no good reason to not run a cat.

ExtCab96S_Dime · 07-08-2008, 06:44 PM

Quote: Originally Posted by greencactus3

$60 for a new cat... id say its worth it...

I'm with Ryo. I'd pay the 60 dollars and not have my truck smell like shit and put out better emissions rather than leave it cat-less.

Solid10 · 07-15-2008, 01:54 PM

ehh...it'll only smell like shit to people driving behind u.

if the truck smells like shit u got an exhaust leak

spencer427 · 08-12-2008, 03:47 PM

Quote: Originally Posted by Nario

I'm calling bs on the loss of mpg. Im getting 20 mpg without a cat.

It might depend on the vehicle , I cut off the cat on my truck and replaced with a section of pipe now it has a noticeable loss in fuel economy just going on how often I have to fuel up compared to before. I have no idea why, dosent make sense.

07-02-2008, 08:08 PM	#1
crywolf Registered User Join Date: May 2008 Posts: 9 Location: User is: OffLine	Cat or nay Just wondering if not running a cat on my 98 4.3 s10 will cause any major problems or not. Other than the legality issue is there any other major reason why I couldn't just ditch the cat? It's rattling like crazy and I'd rather just get rid of it. Thanks for the help!!
	[Reply w/Quote]

07-02-2008, 08:39 PM	#2
greencactus3 bellcranks no more Age: 20 Join Date: Nov 2005 Posts: 22,184 Location: ann arbor, mi User is: OffLine	Re: Cat or nay cel light. no major problems
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07-02-2008, 08:47 PM	#3
crywolf Registered User Join Date: May 2008 Posts: 9 Location: User is: OffLine	Re: Cat or nay Well.. I'm a stingy bastid and I could live with a cel if I didn't have to pay for a new catty...haha
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07-02-2008, 09:01 PM	#4
greencactus3 bellcranks no more Age: 20 Join Date: Nov 2005 Posts: 22,184 Location: ann arbor, mi User is: OffLine	Re: Cat or nay $60 for a new cat... id say its worth it...
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07-03-2008, 07:50 AM	#5
Solid10 i hate people. Age: 19 Join Date: Aug 2005 Posts: 387 Location: Memphis, tennessee User is: OffLine	Re: Cat or nay i have a 93 and i welded some pipe where my cat was. never want a cat again! and i didn't get a CE light-my O2 sensor is BEFORE my cat in the stock exhaust system
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07-03-2008, 12:16 PM	#6
greencactus3 bellcranks no more Age: 20 Join Date: Nov 2005 Posts: 22,184 Location: ann arbor, mi User is: OffLine	Re: Cat or nay Quote: Originally Posted by Solid10 i have a 93 and i welded some pipe where my cat was. never want a cat again! and i didn't get a CE light-my O2 sensor is BEFORE my cat in the stock exhaust system yea, pre obd2 isnt it?
	[Reply w/Quote]

07-03-2008, 12:55 PM	#7
crywolf Registered User Join Date: May 2008 Posts: 9 Location: User is: OffLine	Re: Cat or nay Anyone know what the stock exhaust pipe size is on the 4.3?
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07-03-2008, 01:12 PM	#8
Solid10 i hate people. Age: 19 Join Date: Aug 2005 Posts: 387 Location: Memphis, tennessee User is: OffLine	Re: Cat or nay Yes i have OBDI. and i have no idea crywolf, last time i saw my stock pipes i was 14 :-\
	[Reply w/Quote]

07-03-2008, 03:36 PM	#9
truefire04 Cutting Edge Join Date: Aug 2006 Posts: 270 Location: Riverview Florida User is: OffLine	Re: Cat or nay well i gutted the cat on my v6 when i had it, the ces light came on got a new o2 sensor and got some sparkplug arestors drilled 1 out, and left the other alone put them together and put them in the exhaust and put the o2 sensor in and as i was driving down the rd. the ces light when off.pipe size is 2 1/4.
	[Reply w/Quote]

07-03-2008, 07:32 PM	#10
MINTSICK Snake in the Grass Age: 26 Join Date: Oct 2003 Posts: 11,057 Location: Lynnfield, Ma User is: OffLine	Re: Cat or nay CEL and won't be able to pass emissions (if you have these in your area) with the CEL triggered (o2 simulator, editing the post cat o2 out with a PCM tune, spacing the o2 sensor, etc can fix the CEL issue). IMO I have done both and after finally ending up with a high flow cat on my last system I would never bother not running a cat on an obdII vehicle again. A quality high flow cat honestly produced the same sound as running no cat did for me but without the eye burning raw fuel fumes/smell.
	[Reply w/Quote]

07-04-2008, 07:48 AM	#11
snoplow S-Clusive OH? Age: 26 Join Date: Dec 2007 Posts: 697 Location: rittman, ohio User is: OffLine	Re: Cat or nay i think mine was 2 1/2 outside but im not sure sut it out measure it at the od dimesion and go to ur local store and get that same size but in id and slip it on and weld it up i did i love the sound u get and no cat rattle
	[Reply w/Quote]

07-05-2008, 02:57 PM	#12
crywolf Registered User Join Date: May 2008 Posts: 9 Location: User is: OffLine	Re: Cat or nay Ok thanks for the help everyone! So it sounds like the stock pipe is 2.5" o.d.?
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07-06-2008, 12:53 AM	#13
chevyrules05 IN A HICKTOWN Age: 19 Join Date: Jan 2008 Posts: 745 Location: VERO/STUART FL User is: OffLine	Re: Cat or nay 2.5 inch and if you take your cat off you will loose mpg
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07-06-2008, 06:17 PM	#14
Nario Nario Join Date: Aug 2007 Posts: 54 Location: Corbin, Kentucky User is: OffLine	Re: Cat or nay I'm calling bs on the loss of mpg. Im getting 20 mpg without a cat.
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07-07-2008, 07:51 AM	#15
Solid10 i hate people. Age: 19 Join Date: Aug 2005 Posts: 387 Location: Memphis, tennessee User is: OffLine	Re: Cat or nay Quote: Originally Posted by chevyrules05 2.5 inch and if you take your cat off you will loose mpg taking a cat off helps your exhaust flow better. meaning-your truck can shit better, so now it can eat better. what makes you think it hurts mpg
	[Reply w/Quote]

07-07-2008, 07:52 AM	#16
Solid10 i hate people. Age: 19 Join Date: Aug 2005 Posts: 387 Location: Memphis, tennessee User is: OffLine	Re: Cat or nay well, i guess it depends on where your sensor is. Mine was before the cat, so it still reads the same thing as if the cat was still there. And i took off my magnaflow "high flow" cat...yeah right, that thing was some kind of gimmick my truck was much more toned after i tossed it
	[Reply w/Quote]

07-07-2008, 11:42 AM	#17
MINTSICK Snake in the Grass Age: 26 Join Date: Oct 2003 Posts: 11,057 Location: Lynnfield, Ma User is: OffLine	Re: Cat or nay There is no mpg loss from not running a cat converter, period. Sound output between no cat and a high flow cat is debatable, like I mentioned before I went from no cat to a Spintech High Flow and noticed no difference in tone.
	[Reply w/Quote]

07-07-2008, 12:55 PM	#18
Solid10 i hate people. Age: 19 Join Date: Aug 2005 Posts: 387 Location: Memphis, tennessee User is: OffLine	Re: Cat or nay maybe it was just my magnaflow.
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07-08-2008, 01:03 PM	#19
2002dime Registered User Age: 26 Join Date: Jan 2008 Posts: 182 Location: Joplin, MO User is: OffLine	Re: Cat or nay There is a huge difference in sound from no cat to having a cat along with my magnaflow 40 series. I have a obdII model with a straight pipe, and have yet to throw a ECM code.
	[Reply w/Quote]

07-08-2008, 04:37 PM	#20
MINTSICK Snake in the Grass Age: 26 Join Date: Oct 2003 Posts: 11,057 Location: Lynnfield, Ma User is: OffLine	Re: Cat or nay Quote: Originally Posted by 2002dime There is a huge difference in sound from no cat to having a cat along with my magnaflow 40 series. I have a obdII model with a straight pipe, and have yet to throw a ECM code. I said between a high flow cat and no cat, there was a noticeable difference with a stock cat. Either way nowadays there is really no good reason to not run a cat.
	[Reply w/Quote]

07-08-2008, 06:44 PM	#21
ExtCab96S_Dime Wannabe Dragger Age: 21 Join Date: Jun 2005 Posts: 1,083 Location: Neenah, Wisconsin User is: OffLine	Re: Cat or nay Quote: Originally Posted by greencactus3 $60 for a new cat... id say its worth it... I'm with Ryo. I'd pay the 60 dollars and not have my truck smell like shit and put out better emissions rather than leave it cat-less.
	[Reply w/Quote]

07-15-2008, 01:54 PM	#22
Solid10 i hate people. Age: 19 Join Date: Aug 2005 Posts: 387 Location: Memphis, tennessee User is: OffLine	Re: Cat or nay ehh...it'll only smell like shit to people driving behind u. if the truck smells like shit u got an exhaust leak
	[Reply w/Quote]

08-12-2008, 03:47 PM	#23
spencer427 Registered User Join Date: Feb 2008 Posts: 184 Location: User is: OffLine	Re: Cat or nay Quote: Originally Posted by Nario I'm calling bs on the loss of mpg. Im getting 20 mpg without a cat. It might depend on the vehicle , I cut off the cat on my truck and replaced with a section of pipe now it has a noticeable loss in fuel economy just going on how often I have to fuel up compared to before. I have no idea why, dosent make sense.
	[Reply w/Quote]