anyone running an AFP 20g billet on a newage sti, do these spool alot better than the original 20g? make more power?

just trying to compare a SC40 and a 20g as looking to get 400bhp with as little lag as possible and at a realistic cost.

The 321h billet would be my 1st choise but these are bloody expensive.

 

I about to try a Kamak 20g with some fancy billet and aerodynamic stuff. I have currently have a normal 20G so can let you know the difference when its fitted!