dimetweaker

iTrader: (1)

I had intended to run dual 2.5" exhaust into a single 3" into the turbo, but the hooker manifolds I bought have 2.25 inch collectors. Is there any reason to step up size after it necks down like that or should I just run it as it?

I have posted several threads / questions in regards to changing up turbo size since I was worried my motor may be choked by a T4 flange/ 1.15 ar housing in the engine bay. I had decided to bag the turbo idea since I wasn't sure I wanted to try to fit a larger turbo with a T6 flange under the hood, and just get the car on the road instead of buying twins to make packaging easier up forward. But.... since I had to run exhaust out the back anyways, I decided to just put my little T4 under the back seat, instead of a muffler build thread to follow shortly

jridenour31

What's the rest of your setup that you're worried about backpressure on a t4 with? Without any info on your combo, I still think 2.25" is more than enough, especially for a rear mount.

dimetweaker

iTrader: (1)

LS3, cleaned up to 4.070 so somewhere around 382 cubes. 10.3:1 compression, stock heads ( L92 ), 229/240 .614/.615 cam, stock truck intake manifold. T-56 and 3.70 rear gear.

Turbo is a turbonetics T-78 BB W/C F1-68 wheel and 1.15 ar split scroll ehxaust side.

jridenour31

Stay small.