well i already have a t3t4 turbonetics turbo..i dont know the exact trim...but i also might be wrong about the piston comp ratio...im tryin to figure it out...but they are 9.8:1 in a gsr...so .i have a ls bottom end..ls crank/rods and b16a head..what comp would be too high for turbo and 350whp..cuz obviously with higher compression itll take less boost to make 350whp..i think with t3t4 10psi should b close..over 300whp..but one site said about 9.9:1 while another said 10.34:1....so im not positive yet..?