Originally Posted by mofoSTI
What is the best BW turbo to achieve 400 whp with better than stock spool? I plan on trying to keep it simple and as inexpensive as i can. I want to go efr, ig, ts.
if you want something simple, inexpensive and ideal for auto-x with faster than stock spool - our stock location EFR 6258 kit would be my recommendation. we are about to release a 2-bolt lower manifold that would work great with this also.
the other option worth consideration is the EFR 7064 twinscroll iwg, that would be a bit larger but still acheive your targets and goals. both of these are in stock right now, pretty rare for the EFRs
Originally Posted by Leafy
EFR6758 can hit 400, people have already done it on other platforms. Theoretically the 6258 can hit it too but would take a killer tune and very well designed parts all over the engine bay
the 6258 is a 44lb/min compressor so it could do 400+ as long as the engine can breathe