I had K16s with flash + exhaust and thought car was pretty fast (~425-450whp). Then I installed the turbos you have. The difference was night and day! The 60-130 time went from 9.6 to 7.6 with no additional supporting mods. The car felt brutally faster. The whp with the new turbos and minimal supporting mods was ~ 550 on a cool day.

 

I agree with mBailey, wickedly fast, actually frighteningly fast... but I can not compare a before and after hence my answer. My car has an ECU flash (Evoms) with 1.2 max boost. Should produce up to 550 HP (between 520 and 550 I am told). I have Fabspeed headers and had a Loud Gen 1 exhaust which I just replaced by an OEM system. Must say that I do not think there is a lot of HP difference between the 2 exhausts, there is a lot difference in decibel level ( and cops are getting interested purely because of their efforts to generate revenue ) which is why I changed it back. Even if that difference would be 20 HP or so, I do not think I would miss it in the traffic. But again, it is just unbelievably quick in acceleration and in actual speed. Totally effortless.

 

Mine will have almost every supporting mod fitted with the turbos and im told 1.5 bar is safe

 

Going in on wednesday, fingers crossed the car is all healthy and not in need of any expensive bits