Sounds like it will be fun if you can get it all done.



Why did you decide on doing a 25 head conversion ?, a RB30 single cam would do everything you want it to do !

You are fitting aftermarket pistons, and your fitting a machined 25 head, have you worked out what compression ratio you will end up with ?

With your forward plenum, is it to suit a XF Throttle body or standard (or other) and are you going aftermarket ECU ?.

And are you talking 300hp @ flywheel or tyres, and are you using a auto or manual gearbox ?


What is your budget ?




Im afarid choosing a Turbo is not always that simple ,if you want the right Turbo, there are a thousand questions that need to be answered first, can you talk to the engineer about these things , perhaps he can explain things and help you to get what you want/need rather than us "guessing" ?