606 turbo choices for UK fast street use
606 turbo choices for UK fast street use
A Holset HE341Ve would be perfect for your goal. 300hp, instant spool up and low smoke. As would a wastegated HY35 or HE341.
A 2559 would be way too small for 300hp, even 250hp would be a little restrictive. For a Garrett VNT you should look towards a GT3063V or GT3571V from a Hino application.
Avoid the Ford and GM application GT3771V and GT3788V turbos, the turbines are a very poor design.