Turbo downpipe
I have top mount turbo(GT3076r) with a 2.5 dp, which goes to the bottom of the motor and a 3 inch full exhaust. Question is have that 2.5 chocking the turbo or it really dont make a difference. I have asked many people atp turbo, Mikes turbo, garrett and a few performance shops and everyone is giving me different stories. Atp gave me the best answer which was "the first bind of the turbo is very important you want that to be big for more flow. A gt3076r gives 550hp after 300 hp the 2.5 dp will choke the turbo. So u made 350 on 14 psi upgrade to a 3inch dp and u can make that on 10 or less psi and your top end power would be much better". Just wanted to know from you guys is this is this true or 2.5 downpipe does not matter. Thanks