Garretts was about the same as mine is right now, his is bored over to a 3.0 ltr, Mine is still a 2.8, but I have JE forged pistsons, 8:0.1 compression ratio compared to stock 7:4.1. The head has been rebuilt with a 3 angle valve job and port matched. I am not restricted with a AFM now. The faster you can get air into the motor and out of the motor , the more power you will make. Has any one else lost power from porting the exhaust manifold? from what it looks like stock.. its really not designed that great, 4 cly lead through a tiny little hole to the turbo flange, then the other 2 cly are pretty much open. I am expecting some gains, but I doubt they will be huge.. Every little bit helps though.