I make a occasional 1/4 Mi. pass down the track. I race with full 3 " TTI exhaust with their Dynomax mufflers. This exhaust seems to flow well but I'm wondering if there is even more performance to be had through exhaust modifications. would there be an improvement by adding "cut outs"? Anyone tried this and if so where is the ideal location to install and which brand. Thanks, Danny

68 GTX Full street trim, solid lifter cammed. Best 11.34 @ 121 mph. 1.72 60 ft. (yeah I know.. my 60 ft. sucks)