All depends what power your after and what spec inlet plenum your running

A hart plenum can do 600 hp with a std tb for example and 500 can be achieved on a std 4x4 inlet plenum with a spacer..

I ran a 500 spec hart plenum and 500 tb just so my inlet and outlet was the same on my intercooler for example and that did 642 hp at its best but it may have done that with a std tb??


cheers danny