dude, i guy in my club has no cat and a single chamber flowmaster and a custom intake, its one of the quickest 2.2s i have been in (he let me drive it too), i love the sound too, very unique. id do it if i had a 2.2 5 speed.
i was thinking of just running a straight pipe, but if you take the cat out the service engine soon light comes on, how fast was your friends, i think mine would be quick to because i have headers and a custom intake too.
i gutted mine and i think it killed my power and i got a 2001 s-10 reg. cab 2.2 and i wish i never did cause it cost 250.00 for a factory one. and thats form napa the one from the dealer is like 350.00 and a o2 sensor is 50.00 and it sets the ses light off
I went to my shop to get them and he ordered them from pace setter, they were really expensive, but well worth it, these are nice headers, and you can feel a awesome power increase, just make sure you put them on right and look at all the hoses down there and make sure they don't touch the header