2 1/4" or 2 1/2" h pipe

Bolt on 5.0 · Apr 30, 2007

Does any one know of how much differnce I will lose in running a 2 1/4" instead of 2 1/2" h pipe. I bought my car with a off road pipe, and just picked up a nice used catted h pipe for emissions. Thing is I didnt know it was 2 1/4" until I recieved it.

Anyone have dyno numbers of different exhaust systems?

U2SLO450 · Apr 30, 2007

why not swap the catted pipe out after emissions? The cats are going to make the difference here, not the diameter

whtpny · May 1, 2007

I would do what U2 suggested. The 1/4" difference is neglible. I would say the cats is where some power loss might be seen. Are they high flow cats and or 4 of them?

Bolt on 5.0 · May 1, 2007

Yes they are high flow and I want cats on the car. I like it legal and tired of having to put the clutch in every time a cop is near.

KurtPB · May 1, 2007

dang, i dont want to live in NY, heh. i enjoy my 2.5" downpipe to 3" with only a cummins resignator on my 2.5t. i'd hate to have to have a full exhaust.

Bolt on 5.0 · May 3, 2007

I just finished installing the pipe. It is sooo quiet. Did the high flow cats quiet down your systems alot, or is it just the 2 1/4" pipe. Its so quiet, maybe a louder cat back. DAMN EMISSIONS

grey5.0beast · May 3, 2007

Its definately the cats, My car IS SOOOO quiet with the cats on. I swap it out every year come emissions time

Bad92GT · May 3, 2007

probably because its 2 1/4" mostly.. and the fact cats def down cars ALOT

2 1/4" or 2 1/2" h pipe

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2 1/4" or 2 1/2" h pipe

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