I had my '06 six speed
re-tuned two weeks ago at AZ TPI after the 4.56's broke in.
With:
Magnacharger w/2.9 pulley
C6 throttle body
K & N Airbox
Dayco belt
Air Mobile polished aluminum radiator w/ custom Cobra cooling fan
Stainless Works headers
3" exhaust w/ Magnaflow hi-flow cats and Flowmaster 50's
HP tune
4.56's
all they could squeeze out of it was 498.2 RWHP
That was with Phoenix pump 91 octane premium.
I know you asked about automatics, but hey, if we can do it with six speeds, you can too......
