All that I have is a gutted Intake dual 5" stacks and I still have the cat but no muffler and the BHAF, My best run I ran 313. 8 hp and 588. 3 lb torque. A 05 Duramax went after me and he only got 430 lb torque on his best run and he was completely stock. The dyno guy told him that Dodges will beat the duracrap any day on the dyno so he told the poor guy to chip it to compete. Also I learned how to get past the speed limiter on our trucks, once you hit 105 -108 turn the key to the crank position and the guages will go dead and then you can go to whatever speed you want and the starter does not crank supposedly, the guy at the dyno did it on my friends new HEMI and he brought it up to 134mph on the dyno and he said it works on the CUmmins to but I didn't have him try it on mine. Has anyone else heard of this? I know it works on the Hemi because I watched the guy do it and then he had my friend do it, but I don't know if it works on the cummins because I didnot feal that lucky although he said it works just fine.