A mate of mine runs a EFI RST, 1.6cc, CR 8:5.1, Kent CVH 35, and a Stage 3 T3 (.48/55), but with an untouched head, and it makes peek boost (24psi) at 4000rpm and then pretty much holds 21psi till the limiter.
I know Stage 3 T3's are laggy, and the cam too but I was wondering if the exhaust ports are holding it back on spool up?
Thats a big arse turbine housing and tiny ports feeding it, thought maybe some port work might get it spooling faster?!

What are your thoughts and experiences...