i dont know if this helps but i had an erst about 7 years ago that i spent alot of money on including a universal turbo's stg 3 t3 a vulcan engineering ported andpolished big valve head with a cvh 34 cam and a front mount grs oh and the inlet manifold and injector rail were matched to the head and it was still quite laggy and wouldn't hit full boost til about 3800rpm but that was on mfi