I know this site is for older Pontiacs, but the NEWER have to fit in somewhere?
Anyway, I had my TA Dynoed on 10/23 and it popped 559hp and 543 tq with a FAST intake and a 102mm TB. 1 7/8 ARH headers with a 3" Y into a 4" Mufflex with a 4" straight through Magnaflow. Dana S60 3.73 gears. 3600lbs with me in it ! The tires were spinning on the dyno a little so prolly more there !
LS2 block with Darton sleeves 4.185 X 4.125 stroke. WCCH LS7 heads with the intake port polished and Exhaust re CNC'd. 234/238 CAM .583 max lift on a 115 LSA. Power started dropping off @ 6200 through a SLP lid and a K - N filter.
At 3000 rpm, it had 450 ft lb's of TQ ! Needless to say, it's a blast to drive
Too bad the Pontiac name will be no more in a while. Very sad !