Okay, been doing some research because this intrigues me. I ask because I'm on the fence about buying this from Tone and your numbers totally run contrary to the "at least 15 hp" claim.
I'm going to assume a base weight of 4250 lbs (vehicle + you + gas, fluids, etc), which would mean your 16.7 e.t. converts to a rear-wheel HP rating of ~ 180 hp. If you dropped the time to 16.6 seconds, that means HP of ~ 184 hp, a 4 hp increase from adding the muffler and interceptor. Does that look right? I know this isn't completely accurate, as your vehicle wasn't weighed at both races, and the e.t. method isn't exact.
15 hp would mean running about a 16.3 e.t. under similar conditions, and you didn't gain even a tenth with just the muffler installed, right?
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