There's not much you can do for 300, but for a little more you can look at getting some itr cams, and skunk2 springs and retainers....... Thatwill increase your midrange as well as get you more power up top, past your current 8200 rpm redline.

Just curious vteg01, with your current setup ( IM, CAI, Exhaust, Header), have you noticed a significant improvement over stock ?