yeah so i have a stock gsr head with skunk 2 manifold and 68 mm throttle body..trp fuel rail with 680 fuel injectors. Ls block with gsr pistons. gsr tranny with ACT 6 puck clutch. I tuned on a cheap ebay turbo at the wastegate setting of 9 psi and pushed out 240whp. My question is..the head work doesnt really make too much of a difference for power right? It's all the turbo work, so that means a better/bigger trim turbo. and mabye some pistons so i can boost more right? well..i want to make 300whp..what do you guys think i should get to make this power?