Who builds the best 904?

The OP's original question can never be answered cause it's a loaded question. I think we all know people that build great stuff and knowing their quality of work is why we recommend them.

nice thing mine is a stones throw from him

We Use John @ Magoo's Automotive, he builds all our transmissions, race or street.

John Shur
623-362-1765
he is up on Deer Valley and 88th Ave

tell him SS and AFX sent you