I have been given the job of selecting a cam/stall/gear for a guy and installing the parts.
He has an A4 2001 Z. As far as cost, money really isn't an option on the stall/cam selection.
I was thinking of getting an G5X4 cam or possibly a T-rex. Something that will pan out some good N/A track times with factory heads and LS6 intake or possibly a FAST intake.
What be the best gear/stall set up for an X4 or a T-Rex?
And also, if you or anyone else has these cams in auto cars, what kind of time have you ran?

-Thanks