I tried to get a video of it earlier, but with the exhaust and road noise I couldn't hear it on the video.. But as far as the knock goes... I have not asked them, But to me it doesn't come from the engine, it comes more from right by the x-pipe, and also the front end of driveshaft where the sheet metal is. Does the sound come directly from the engine or would I hear it further back if it was a knock? And I'm not sure if this matters or not, but I tried just doing a rev while in park, and it makes no sound in higher RPM.
Black 2011 V6 - Totaled
Candy red 2012 V6 - Sold
Candy red 2013 V6 PP - SCT tuner with Jon Lund tuning, BBK TB, FRPP Sport Axlebacks, Airaid CAI. SOLDDDDDD
2003 Redfire Terminator - Too many mods to list, SOLDDDDDDD
2012 Yellow Blaze 5.0 - M6, Lund tune, GT500s, O/R H pipe, and some other cool stuff