I have a 2006 GMC 2500HD with the Vortec 6.0L. I just put a K&N air filter on it and I'm going to be putting on Flowmaster Super 40 mufflers-dual exhaust. Anyone have any other performance accessories they would recommend for my pickup? Thank You

Tbi Spacer, True Dual Exhaust im not sure if htat is what your getting. A chip of some sort, and since yours is newer the performance market is open to the newer trucks so theres is so much more you could do to get more performance. If you already havn't changed switch to a oil like Royal Purpal, MObile 1 Full Synthetic .

If i think of anything else i will let you know

Hopfully this helps though.