I run a trd HG on my forged engine, but run lower compression then most due to dished pistons, yet since being on the omex, I can drive very well off boost. stock compression is very good, if raising it, 99ron or higher and a standalone is most important to help gain best tune and power.. 99ron fuel has a higher threshold before det then 95, that's what the ron means. higher octane rating less change of det.