exhaust size?

[birdman]

does anybody know the stock outer diameter just before the cat and just after the cat. i think im going to just cut the cat off and put stright pipe in there, has anyone done this, how well did it work? thanks.

[5speedz34]

The downpipe is 3" and goes into a 2.25" and then stays at 2.25" IIRC.

[JNGTP94]

it does stay 2.25, when i had my 40's put on i had it replaced with 2.5 though, can i feel a difference... nope lol

[Kalgorn]

I thought it was 3" downpipe, 2.5" piping back to split, 2.25" piping from split to mufflers.

 

??

[Euro]

im pretty sure its 2.25 all through...minus the DP of course

[pwmin]

where it splits to dual, mine was 2.0" od. it was 2.25" od before the split. maybe that's why my car is so slow

[5speedz34]

where it splits to dual, mine was 2.0" od. it was 2.25" od before the split. maybe that's why my car is so slow

 

Stock exhaust has alot of stupid kinks.

[slick]

From 60*V6 website: The 3.4's got a 2.5" downpipe stock. After the cat, it was 2.25" back.

[birdman]

so is the downpipe 2.5 or 3. it seems like 3 is quite big for the 3.4. and does the change occur at the cat or just before or after because it the cat has 2 different size inlet/outlet im going to need a pipe that has one bigger/smaller end.

[slick]

It is 2.5". The pipe going into the cat is 2.5, the pipe coming out is 2.25.

[birdman]

thanks, has anyone done it? does it make the exhaust sound any worse/better??

[slick]

What, having larger exhaust put on? Hell, I think most people do it.

 

Yes, it will make it louder. Most aftermarket mufflers are gonna be louder. You can add a resonator to quiet it down though.