Turboback Exhaust Question

[rock0134]

Would having custom turbo back exhaust from say exhaust pros (3 inch) be the best thing to do performance wise and cost wise for full exhaust? And my muffler is only a 2.5 inch ID so would having 3 inch all the way and then having that muffler restrict it a lot as opposed to a 3" one?

[Black99GST]

yeah, best bang for the buck, and yeah the 2.5 will restrict alot as apposed to a 3" but, a megan N1 style 3" muffler only off ebay is going got $50....

[rock0134]

How much do you think the custom piping would be. Would aluminum alloy be a lot cheaper than stainless steel?

What kind of power increase is felt with full 3" piping?

[BoostedSpyder]

you need a new downpipe to go with the exhaust. get one from RRE they are the best. then get a custom bent exhaust from anywhere, should be pretty cheap. make suer they weld the rung for the 2nd o2 sensor in there too. and get a testpipe to go with it. should be good for 10-15hp with the turbo you are running...

remember that the best exhaust for a turbo is none at all!

[rock0134]

the exhaust shop cant do a custom downpipe too??

What I have right now is stock downpipe, test pipe, 3" catback, 2.5" muffler...

[spyderturbo007]

You are better off going with a pre-built downpipe. I have seen too many exhaust shops screw up the flex section when they attempt to fabricate them. You will also have to go through the hassle of buying the correct flange, O2 sensor bung and flex section, then paying them to assemble. You might as well just buy the downpipe.

[steviek]

Originally Posted by BoostedSpyder

should be good for 10-15hp with the turbo you are running...

remember that the best exhaust for a turbo is none at all!

I actually think a turboback 3' exhaust with a test pipe and 3 inch muffler would make more than an extra 15hp on the evo3 vs stock. I've seen like 8hp increase just with a muffler.. I dunno though 10-15 seems a little conservative.

[Black99GST]

i payed $250 for mine turbo back with my apexi N1 muffler i got offline from ebay, but then my car was hit buy that vette, and i made him buy me the real apexi exhaust... lol

Edit: i also bough a megan racing 3" downpipe off ebay for my downpipe... but i here they have fitment problems on the GSX's... but eh! onlu $100

[BoostedSpyder]

10-15 to the wheels, probably 20 to the crank, also no fuel mods ~ low boost issues.

[steviek]

yea good point I was thinking of a more maxed out evo3

[4g63gst20]

Originally Posted by Black99GST

i payed $250 for mine turbo back with my apexi N1 muffler i got offline from ebay, but then my car was hit buy that vette, and i made him buy me the real apexi exhaust... lol

that was a good one. last time i asked a shop they quoted me for about 400 buck plus my muffler for a turbo back exhaust.

[rock0134]

Ok, I think Im going to upgrade the full exhaust and then do the fuel pump to walbro 255 later. I am looking at the apexi n1 catback exhaust on ebay but i need a downpipe that will connect perfect, preferably without a cat. Anyone know one? Will the downpipe connect direct to the exhaust manifold with a perfect fit?

[gthompson97]

RRE has a good downpipe.

[rock0134]

Yea those are kinda expensive... I found this one on ebay, would this bolt right up perfect? And does this one look like it eliminates the cat?

http://cgi.ebay.com/ebaymotors/Stain...10189402QQrdZ1

[4g63gst20]

it's suppossed to eliminate de cat, since it says offroad use only.