my buddy has been buying parts for his turbo setup. he's building a d15 with a z6 head. from what i know a d15 mini me is in the 10's for compression. any other pistons he could put in there to drop the cr? he's got a t3/t4 .57 trim trim turbo, ram style manifold, knockoff bov, 2.5" charge piping, a front mount so far. he's going to be runing low boost initially but what size injectors should he run? any tips on what else he should get? i'm into b series so im outta my element somewhat. i know a .57 trim turbo is pretty large for a stock d to be running. any clue on when it'll spool up?