ill prolly be goin with the edelbrock catback or ss takeoff. does 3" make the car lose too much back pressure? i know its good to lose some but is there a fineline between enough and too much?

 

I'd say on a mildly modifed v6 3" may be too big
alot of people like the 2.75" pipes from the v8
I have a cat back I'm tryin to sell with a 2.75 I pipe & s-pipe(bouth put new on my car, didn't come off a v8) with a flowmaster 80 and 2.5 tailpipes

I think edelbrock also makes a cat back with a 2.5 i pipe

 

edelbrock dosent make a catback smaller than 3" except for the 2.75 for ls1 with dual cats.

 

I have the 3" Borla and I havent noticed any performance loss, if anything it feels quite a bit faster especialy from 40+

 

i know it wont make you lose performance but is it "bad" for the engine? some say it will foul the plugs and such. will it breath TOO well?

 

I know what you are saying, but , you are still running through the stock headers, the Y pipe, cat, and S pipe. That is 1/2 the system there and I figured that would be my restriction.

 

you loose some bottom end torque, but gain some high end. The change is for the better though.

 

You'll get mixed opinions on 3"...some swear they didn't feel any low-end loss...some say they did but the difference was felt up in the higher RPMS.

When I first got my exhaust, it felt a LOT BETTER up top...it went faster on the freeway with the same amount of throttle and from 60+, on acceleration it kicked a lot harder.

Down low, I didn't feel that much of a difference. Weird though...on my friend's car (same engine), after the 3" installation his car felt real slow down-low. We jumped into my car and it felt a lot better...his car was stock induction too though.

If you want to play it safe, you can just get a 2.75" pipe...two friends installed them on their cars and I didn't feel any lowend loss and the topend performance was still very nice.

 

ive got 3 inch highflow from manifold back to 4 inch pipes....on my 3.4...trust me they are too big....sounds pretty mean though especially at low RPMS....havnt really noticed a difference cept it feels like there is no engine....its wierd....must be lack of backpressure but feels like engine has no tourqe..... plus with pipes that big u need headers if not and it is cold where u live they cool down too quick causing exhuast manifold to crack...mines cracked 3 times....

 

That is WAY too big...I'm sure top-end pulls better but you must have no lowend. I hope I'm misreading it and the 4" is your tailpipes and not your I-pipe...

Unless of course your blown...then thats good.

 

nonono the last 18" are 4 inch....actually 4.25" stainless steel tips ... its 3 inch from the manifold to a highflow cat with 3.25 out to the tips....and yes i know they are way too big.....finally got the money for the engine swap for this summer which includes some major engine rebuilding before putting in ....as well as headers and a 6 speed swap... and off the line right now the car sucks

 

does the edelbrock catback for 95-97 3.8s fit my 98? they dont make one that fits 98+. is there a difference or will it fit? part # is 5658

 

It's 3" from cat to muff. and then dual 2.5" out. I have it

 

I would like to know if the stock I pipe from a 1995 Z28 will fit a 1995 V6 (3.4)? I'm almost certain both have just one cat and hopefully they are interchangeable. Also, what is the stock diameter of the V8's I pipe? Thanks!

 

Z28 = two cats
V6 = one

Stock I-pipe is 2.75" and will fit.