which mod to do next....?
You're not making enough power for the MAF to be a restriction at this point, and the car will run the best with the stocker. I say leave it alone (un-ported, and not de-screened either).
Stall is a MUST with an auto, along with a trans cooler. Gears in the rear end for a 6-speed car is just asking for problems. The t56 is a PARTS WRECKER.
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For the ones you listed, ASP pulley would be good, it's a solid 10 rwhp. Ported stock TB and ls6 intake manifold are meant to go together, they make a good combo.
You could also consider True Duals, like the Bassani True Dual kit. It's always nice to sound fantastic and make a little more power.
barely any, the power you get will come from the tune


