Yeah that's right I said 4" exhaust. Has anyone ever seen one on a 4th gen? It's probably overkill for my gt35r setup, but i just put my ESP traction bars in and I got to thinking that "I could probably fit a 4" if I wanted to" lol. I don't necessarily plan on doing this being that I have all the material for a 3", but I was just curious if anyone had ever seen one on a 4th gen..... because I sure haven't.

 

i would think a 4" pipe would scrape, especially right under the oil pan.
i have seen pics of it done one one prelude, so i can say yes it has been done.

what are people doing about 3" downpipes/flex pipe clearance? right below the oil pan. too low. would a moroso pan save any room, even and inch would be nice.

 

my friend has 4.5, so it can be done, may have to modify to fit kind of crap though.

 

isn't md or oaks running a 4" exhaust?

 

2 inch would be enough.

 

How?

 

2" is definitely not enough for a GT35R... 4" would be tough. Getting under the oil pan and then under the rear control arm would probably be the tightest spots.

 

i think gregbb1 was running a 4 inch setup...
it can be done..
but if you are going to be driving it on the street much... stick with 3.

 

oh my bad i didn't realize it was a GT35R, i misread it. haha

 

GregBB1 did have a full 4 inch aluminum exhaust on his car, granted he was making 640 whp and drove it on the street alot. The flex section was a bit rubbed up, but it worked for sure. The exhaust would still be cool to the touch at the tailpipe after repeated hard runs!

If you are really pushing a GT35R, it could use the breathing for sure, just don't expect to have the lowest car in town.

 

What would 2" be good for period is what I want to know??
Mostly stock H22s with 3" exhaust have had proven gains.
So I don't know what 2" is going to help at all..

 

I got a 4in DP on my 5th gen.... Pictures on link

 

why would a cool tailpipe be of any benefit?

 

Well, I haven't heard from md23 yet, I'm curious as to what he's running.....

I agree, the tighest spot would be the rear control arm area.... I have the moroso pan, I think it will fit through that area ok.... The other part I'm worried about is right off the turbo. I specifically bought the ESP traction bars to allow for more room for a bigger DP, but now that they're installed, the crossbar is basically in the worst spot it could be, directly below where the DP should run. If I trim the tabs for the "front mount" off the cross bar because I'll never use them, I think I can get it through. I also was thinking of using a 135 degree bend directly off the turbo, but I can't be sure that will work without actually doing it, and I don't want to blow 80 bucks on the bend just yet. I know a "pipe-cut" DP would snake its way in there just fine, but I'm not about to drop a G on an exhaust.... unless it really comes to it. Worst case, I already have everything I need for a 3", I'll just run that.

If anyone can find pictures of a 4" on a 4th gen, I'd love to see them, I can't find anything as of now......

 

4" is pure overkill. 3" IMO is the biggest you can go without asking for trouble. If you're that worried about back pressure, get a 3" exhaust from the turbo-back and get an electronic exhaust cut-out and install it before the cat on the DP.

Seriously.. I can barely drive my car with my 3" DP as it is.. 4" from the oilpan back is just stupid.

 

Well, its only overkill if you're running a really small turbo.... ask any of the SFWD drive guys they all run 4" on a "street car". Hell, some of the large turbos come with a FIVE INCH v-band now! The only trouble I see in running a 4" is the clearance issues, and the cost cuz I'm a cheap SOB. I don't run my car 1/2" off the ground, but also don't like thinking about my exhaust hanging down lower than any part of my car, if I were to do this, I'd make up some sort of skid plate to at least take some of the impact if I hit sometime. Like I said, I haven't made up my mind, I just got to thinking about it and wanted to see if anyone had done it yet....

 

here is mine, 4" straight of the turbo, i have a fullrace ramhorn with a SC61 (soone to be BWS366)

 

check your pm

 

its turbo... open downpipe FTW

 

busa hunter, I can't tell from that picture, but are you using some kind of home-made traction bar? If so, it looks like your cross bar is much farther forward than mine, and also that your turbo may hang a bit farther away from the block than mine (i'll post a pic tonight so you see what I mean) I am glad to see how it looks though! Nice job!

If my cross bar wasn't it the location that its in, I would be just fine, its just going to be tricky to get around.... my plan was to tack it together myself and have it finish welded by a professional. But getting the DP through that area might be more than I can chew....