I've been wanting to do some back-to-back dyno testing with the NPP muffler on my Ls3 base C6 Corvette to see if they hurt or help power. I finally had some time to get on the dyno do some pulls, change the mufflers and do more pulls. The Dumps on the corvette definitely like to shoot flames so some people might like that.

The two exhaust setups tested were 3" xpipe to 3" dumps vs the 3" xpipe to 3" mid-pipes, to the OEM NPP dual-mode 2.5" mufflers.

The Test Car's setup.
2008 4lt base LS3 based 416 is set up for boost, trickflow gen x 255 heads (unported) 69cc chambers, BTR custom grind cam blower cam, BTR Valve springs, BTR Trinity intake manifold (unported), stock ported throttle body, Wiseco dished pistons, K1 rods, K1 crank, Johnson 2126lsr lifters, ARP everything, Circle D 258mm converter, 6l80, stock 2.56 gears, kooks 2" headers, vararam intake, fuel injector clinic 60lb injectors, walbro 450 pump, ati 10% UDP, GM flex fuel sensor, this was on 64% ethanol, BST C6 6l80 Differential Brace.

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