# WTB: Test Pipe for stock exhaust
**URL:** https://forums.speedlife.net/t/wtb-test-pipe-for-stock-exhaust/99990
**Category:** Classifieds
**Created:** [September 17, 2006, 8:59pm UTC](https://forums.speedlife.net/t/wtb-test-pipe-for-stock-exhaust/99990 "2006-09-17T20:59:08Z")
**Posts on this page:** 5
**Page:** 1
### Author:  [@system](https://forums.speedlife.net/u/system)
#### Post date: [September 17, 2006, 8:59pm UTC](https://forums.speedlife.net/t/wtb-test-pipe-for-stock-exhaust/99990/1 "2006-09-17T20:59:08Z")
Looking to replace the cat converter on my stock exhaust. Not sure on this one, but a test pipe for a 2" stock exhaust would be different than one for a 3-4" right? Anyways, anyone that has one that will my stock set-up let me know.
Thanks
Leo.
---
### Author:  [@krgoodwin](https://forums.speedlife.net/u/krgoodwin)
#### Post date: [September 17, 2006, 9:34pm UTC](https://forums.speedlife.net/t/wtb-test-pipe-for-stock-exhaust/99990/2 "2006-09-17T21:34:02Z")
2" test pipe would be 1 and 2 inches smaller than 3 and 4 inch ones. not that im trying to convince you not to, but why? its not going to give you a noticable hp gain and you wont pass emisions. more hassle than its worth imo.
edit: asuming you plan on driving your car on the road.
---
### Author:  [@DirrtyDevo](https://forums.speedlife.net/u/DirrtyDevo)
#### Post date: [September 17, 2006, 9:39pm UTC](https://forums.speedlife.net/t/wtb-test-pipe-for-stock-exhaust/99990/3 "2006-09-17T21:39:51Z")
with my crush bent 2 1/4 catback and magnaflow XL muffler and a punched cat i noticed a decent gain…felt like was on empty on a 3/4 tank…torque stayed up there as well more top end on the highway. Not too much louder either…engine runs smoother without the cat as well starts up insanly quick too.
---
### Author:  [@krgoodwin](https://forums.speedlife.net/u/krgoodwin)
#### Post date: [September 17, 2006, 9:44pm UTC](https://forums.speedlife.net/t/wtb-test-pipe-for-stock-exhaust/99990/4 "2006-09-17T21:44:00Z")
> [@enzos\_lil\_schumi](#):
>
> with my crush bent 2 1/4 catback and magnaflow XL muffler and a punched cat i noticed a decent gain…felt like was on empty on a 3/4 tank…torque stayed up there as well more top end on the highway. Not too much louder either…engine runs smoother without the cat as well starts up insanly quick too.
I was talking in terms of stock exhaust, since i noticed leo’s stock muffler at cayuga. unless hes getting a cat-back, in which case i lose.
---
### Author:  [@system](https://forums.speedlife.net/u/system)
#### Post date: [September 18, 2006, 12:22pm UTC](https://forums.speedlife.net/t/wtb-test-pipe-for-stock-exhaust/99990/5 "2006-09-18T12:22:20Z")
here’s the deal, quite simple really: The engine is getting stage 2 cams. To help the flow, I’m doing a minor intake job so it can breath in easier. The KA header is decent stock, and I’m against 3" cat-backs on a stock set-up. So an easy way to help the engine exhale is to remove it’s crazy honey-comb-like cat converter.
I’m not looking for power gains, just to help the engine run better.
Anyways, how 'bout someone post a test pipe FS this time… 😉
Leo.