Have you priced a turbine housing?
You should be able to swap it for a tighter unit and get the results you want.
My original turbine housings were Turbonetics T3 Stage 3 with .68 A/R. They were so tight the engine couldn't pull more than 4900 rpm on the dyno. I stepped up to Stage 3 .96 A/R turbine housings and kept the same Stage 3 wheels. I have been happy ever since.


We are brothers and sisters doing time on the planet for better or worse. I'll take the better, if you don't mind.
- Stu Harmon