I am working on building a boosted D series. I am not buying any ebay parts and trying to make it reliable as possible. Power numbers should be around 300+/- to the wheels. My question is when should the transmission be beefed up? Will the trans hold up at these power numbers, with only a clutch and flywheel? If it needs to be beefed up where is a good place to have it done?

setup will be....

D16Y8

Turbo- Precision 4831B .63 a/r
GO-Autoworks Cast manifold
Tial 38mm WG
HKS SSQV BOV
FMIC 2.5 piping
Full 3" turbo back exhaust
750cc RC injectors
Walbro 255
RCautoworks custom d16 rods and vitara pistons(75.5mm)
Comp Clutch stage 4
Comp Clutch 9lb flywheel
Tuned on chrome

any input would be greatly apprenticed.