very very sick car hahaha makes me very jealous i dont have 18k to through into this setup.

Yes. Resonators/silencers, whatever you wish to term them, they work! And I didn't have a noticable drop in power after putting them back, either.

i love how a TT 370 looks bone stock just with long tube intakes... even with the hood open, total sleeper

hey stormcrow just wanted to let you know me and sam were talking about you the other day. I was looking in the market for exhaust and I was telling him about the noise you were having with the greddy so thats why I decided to go with the HKS. i like the sound of it and think it looks pretty cool.

So now my build is consisted of
GTM stage 2 Twin Turbo(turn key)
GTM competition oil cooler
2.5 Test pipes
2.5 HKS exhaust

Every thing bought and paid for just waiting for it to get to my door so me and my buddy's can install it. So my HP goal is about the same as yours. I am looking for 500rwhp because I agree with you anything more for the street and random track visits is pure waste. Thanks again for the post and sharing your build since it had a huge influence on mine
Frank

If your goal is 500 I would go 3" down pipe and 3" exhaust

Honestly at first I was thinking this same exact thing, but sam reassured me that I will have no problem hitting 500 rwhp with this setup. Also isn't this a ongoing argument Fusz weather to get 2.5 or 3 for TT. I think some say with 2.5 your lower end is better but 3 gives you better top end then lower end. LOL i don't know feel free to chim in on that and take me to school lol.

As for what I have ordered I am just going to stick with the 2.5, like i said Sam said there will be no issue hitting my goal with this setup
Frank

You are correct with your stats, but I think you will get to 500 easier with 3"

No problem, Frank. Glad you could learn a bit and that I could help. I look forward to your thread with your final build and results! :)


No reason for 3" for 500whp on a DJ on the 3.7l motor. Actually, if you go with internal wastegates (which I did) you can have issue with boost creep/spikes on larger exhaust. I'm not sure if Frank went with external wastegates or not and would not have issue if so...but, he will still be fine with his goals on 2.5" exhaust. Maybe a little more wear on the compressors over time, but not much.

Now if you "massage" the downpipe(s) into 1" there may be issues. :ugh2:

Hmm, 3" was recommended for bigger turbo setups on the STI (2.5l F4). Much smaller engine, granted target boost was 23psi for me then, but I would imagine the 3.7TT flows a lot more than the 2.5T did. Freer is better for FI apps. .02

no 3" really is not a must have for all applications and ecspecially if you are not pushing too much power.

I would stick to what the pros at GTM say you can do and what is safe.

Single piping vs dual maybe?? Dual 2.5 would be 5 inches of total piping.

yeah i think 2.5 is fine for this setup..i believe the greddy kit is externally gated with a dump pipes..

That is not an accurate statement to my knowledge. A 3" single flows more than a dual 2.5" setup. Someone told me once that the single 3 flowed more. Dual 2.5 doesn't equal 5 in this case. The other great thing is that a single 3 weighs less. I loved the JIC Ti I had on my 350z.

definitely 2x2.5 does not equal 5

a 2.5" exhaust has an area of 4.91" to flow the air
a 3" has 7.07, so dual 2.5 > single 3"
and a 5" would have 19.64 square inches, huge!

yeah i would have to agree that two 2.5 setups will flow better than a single 3...the single 3 is less weight but the weight is relatively low to the ground so it really wont affect handling much..also the merging of two pipes into a single collector does create some extra turbulance as opposed to two separate exits..