As far as trannies, the above and also look at Georend. I beleive they all make products that significantly improve upon on stock. MAKE SURE you choose someone your comfortable with and trust to do the install, that is more important than which companies products you choose.
One thing I would say is bigger turbo means it WILL NOT spool like stock. You simply can't expect a 12-16cm exhaust housing and big 'ol compressor wheel to get moving as fast as the 9cm exhaust and little 'ol compressor wheel on the hy35. I like the sps 66 and from 10psi to 50psi it can scare ya. But it takes a few seconds longer to get up to 10psi where it "lights". Perhaps other large turbos behave differently, I just don't understand how (by the way there are lots of things I dont understand).
Injectors helped with turbo spool but rendered my TST useless for all but timeing. I suspect low rail pressure as the culprit and if SPA ever gets my guage to me I can find out for sure.
One thing I would say is bigger turbo means it WILL NOT spool like stock. You simply can't expect a 12-16cm exhaust housing and big 'ol compressor wheel to get moving as fast as the 9cm exhaust and little 'ol compressor wheel on the hy35. I like the sps 66 and from 10psi to 50psi it can scare ya. But it takes a few seconds longer to get up to 10psi where it "lights". Perhaps other large turbos behave differently, I just don't understand how (by the way there are lots of things I dont understand).
