Quote:
Originally Posted by AG383
Yes, the ARH 1-7/8 header kit with high flow cats and x-pipe, 3" all the way back to the rear axle. At the time of the tune I had the 2-1/2" stock mufflers from the axle back. I have since then went to 3" Magnaflows. Have not dyno'd it with those mufflers but it feels like more. I also had modified the stock air box, but Mike found it was killing the HP, later I got a LMR intake. Headers + tune are the way to go.
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nice numbers, i got 396hp and 399tq with the same mods at RMCR