Hey guys...i have had this idea in my head ever since i read that for a turbocharged car...the best backpressure is ZERO backpressure...although that is not possible for a street car..
right now i am sporting a 3" Catless TBE as well as a Toda Manifold, Invidia O2 housing...

my other power making mods include:
-GSC s1 cams
-750cc Injectors
-Greddy Vspec IC + upper and lower piping
-works intake (will be replaced with an ARC induction box soon)
-Greddy Boost controler
and what not...i have all the bolt ons i could think of plus valvesprings and retainers/head studs/walbro...etc.

on its way to me is a 20gLT .. i will be boosting about 25~26 psi.....
so after this very long boring intriduction the question is
do you guys think i should run a 4" exhaust or atleast a 4" catback....anyone ever tried it...?? do you think its an over kill for the FP green? do you think i will gain a better top end? "+'s" and "-'s"

inputs are appreciated
thanks

 

I'm pretty sure buschur is running 600whp+ on his 3 inch exhaust, I don't think its necessary.

 

Damn....that would be a big exhaust!

 

yeah, you really dont need a 4'' for the setup your going to be running.

 

Don't waste the extra money, I highly doubt there would be any advantages with your setup..

 

No need.

Besides, it wouldn't be fun or easy to shove a 4 inch pipe under this car without any clearance issues.

 

2.5 inch can support 600 hp, and 3 inch is good for even more. Don't waste your time or money.

 

i have access to a a good deal and exhaust shop...lets keep the cost aside...would a 4" exhaust or even a 3.5" be more beneficial?

 

I Just wanted to say ive stumbled on to your treads a few times and you are offically my hero. You do all the mods im thinking about 3 months before i do them (im not the best at saving money) so i always look at your car to get a ball park idea of what my 9 will do with the same mods.

Back to the point of this thread. I have always thought about putting an Electric Exhaust cut out that ran a pipe out the front bumper. Maybe that would be a good option for you because then you could drive around with out too much noise and when its time for business you could flip a switch and have a extreamly free flowing exhaust

 

yes it will, how much is the question

 

thsnks bro...this actualy made my day...i have never been anyones hero before except for a few hundred girls..hahahahahah

 

Mods please delete

 

The question: How much of a difference would a 4" exhaust make over a 3"??

 

Not enough to really deal with the fitment problems at the power you will be making.

 

You don't need it.......3 is plenty fine.