You say you have built the box and engine?
you got the 3.8 or 3.8 sport ?
I answer your question of LM900 turbos (efr 6758) rather than the bigger 7163's
quicker spool... and an LM20 deserves to be driven on track so i feel the smaller turbos will give greater trackability
Forged Engine and Dodson Gearbox @880bhp/745ftlb
Fully Stripped out w/ GT3 Rollcage &Tillet Carbon seats
Alcon SuperKit, with Project Mu H16-03 Pads
JRZ RS PRO- With full SPL bushings and Camber arms
Quaife front Diff