Cats and X-pipe size question.
Thread Starter
Safety Car
Joined: Aug 2002
Posts: 4,050
Likes: 229
From: Oxnard CA
St. Jude Contributor
Cats and X-pipe size question.
While shopping for some catalytic con. and an X-pipe package, there are mainly two sizes available- 2 3/4" and 3". What performance differences will be seen between the two different sizes or if the size is all preference?
All info appreciated,
Chris
[Modified by pk2401, 1:16 PM 6/19/2003]
All info appreciated,
Chris
[Modified by pk2401, 1:16 PM 6/19/2003]
Le Mans Master
Joined: Apr 1999
Posts: 7,820
Likes: 0
From: Burlington ON
Cruise-In I, II, III, IV & V Veteran
CI-I & II Auto-X Champ
Re: Cats and X-pipe size question. (pk2401)
I feel 3" is a bit on the big size for a mostly stock LS1 motor. I don't think it would lose you much power in the upper RPMs but would definitely lose you some torque below 4000rpm. I think 2.5" is probably optimum for a bolt-on LS1, 2.75" for heads/cam and 3.00" for stroker/bored LS1s.
I know I lost some torque in the low end even on my 436 over the 2.5" setup I had, but I did pick up 15rwhp from going with larger diameter headers, 3" midpipe and 3" in/out mufflers.
I know I lost some torque in the low end even on my 436 over the 2.5" setup I had, but I did pick up 15rwhp from going with larger diameter headers, 3" midpipe and 3" in/out mufflers.
Thread Starter
Safety Car
Joined: Aug 2002
Posts: 4,050
Likes: 229
From: Oxnard CA
St. Jude Contributor
Re: Cats and X-pipe size question. (MattG)
Another question, has anybody replaced their catalytic con. even though the car isn't 5 years old, 50,000 miles, in need of replacment or whatever the law states.
