G6E / xr6T makes 270kw
Barra 4.0L DOHC DI-VCT TURBO I6
(270 kW 533 nm)
* XR6 Turbo
* G6E Turbo
If you do your front/dump & cat next, then get an SAFC2/neo and a tune, you should be at around 200rwkw. That's around 275kw at the flywheel.
Given the R33 GTS-T is around 350-400kg lighter then a Ford G6E, you should be able to beat one, no?
(that's assuming the G6E is stock...)