Can i put 3 inch exhaust on cammed V6?

[QIK51X]

Hi guys, i have a commodore vr v6 3.8 auto. Recently got the motor reconditioned and while apart threw in a stage 3 crow cam kit. My mechanic also shaved 1mm off the heads. I had a full exhaust system consisting of pacemaker extractors and a 2 1/2 inch straight through But I recently got defected and to pass the EPA test changed my exhaust back to standard but left my pacemakers on. The people at crow cams i talked to told me the best system for my cam is a twin 2.25" exhaust with twin cats. I was just wondering cause am tight with money at the moment if a 3" exhaust straight through with a hi flow muffler will work on my setup or will i lose power? Thanks for your help. Sorry for the long post.

I also have 3.91 gears, not that it will make a difference to what exhaust i need.

[flipsyde]

reconditioned motor and a 3 crow cam kit. My mechanic also shaved 1mm off the heads. hey mate just wanna know how much did that set u back and can u notice the power diffrence as is it worth getting ???

[AdamIan69]

i have done exaclty the same thing to my calais, i went to a exhaust dealer and he said the twin system may be a little to much and he said he would evan try a 3 inch unless he was doing nothing but high driving. i chose pace maker extractors twin cats then into a single 2.5inch over the diff.which is what i got told from my crow dealer, seems to be alright. but i do like the sounds of twin exhausts, i think you a better of asking someone that deals with those cams.

[bennzy]

QIK51X - wouldnt it have just been easier instead of changing back to standard exhaust was to get a ressy on it, i havent really heard people of doing the way that ur thinking of doing on a 6 most people i know just prefer to put ressy on since its cheaper and easier, my old car i didnt even have a cam on the motor i had just pacemaker extractors (comps) and a 2.5inch exhaust system, it was that loud it sure was over the limit easy but since i have a new car and was giving my old car to my bro i had to put a ressy on it didnt want him to get a notice even when i didnt have the new cat and extractors fitted to the car i was just under the limit damn work didnt give me a car that day.

[Infus10n]

Just thought id point out that this thread was posted 10 months ago and the users last activity was 4 months ago, so i think he has done his exhaust by now....

[evil_monkey]

what's a Nutritionist ?

[Patrio7]

what's a Nutritionist ?

*Fishes though bottom of box for random toy of some sort*

[evil_monkey]

*Fishes though bottom of box for random toy of some sort*

hahaha

[RVN 355]

3" ON A V8, NOT A V6 !!! geees... single 2.5" big enough

[clarkey3]

hey qik51x ive got a 3" catback on my v6 ecotec, brought it of someone with a ss for 100 bucks. i could feel slight power upgrade.my other m8 has a vn with the buick motor with stainless extractors and mild steel 3"straight through cost him 850 bucks.he says its too loud and waste of money.

[tuf_calais]

hi mate
you said you have 3.9.1 gears in yor VR how does it run with them in it do you loose a lot of top speed with high gears on a V6 tahnks mate.