What size turbo are you guys running that are hitting low 11's high tens? What what I need to change on my turbo gt30 .70 a/r compressor housing to4s 52 trim wheel. 84 trim turbine .63 air ratio. To make it pull really hard top end? I haven't installed it yet and I think i might be able to swap it for the same thing except 56 trim compressor wheel. Shoud I change the exhaust housing to .82 a/r too. let me know please

 

help?

 

what car what motor, built or stock, we need more info.