I just put it together, and did only one 10-minute test drive.
Sounds great at idle, kinda like a Harley (with mufflers) in a low deep rumble, but not loud.
Cruising is nice FFR Cobra sidepipe sound, mellow deep sidepipe sound.
WOT is like all hell broke loose. ITS LOUD!!! DOH!
Got on I-275 and did a 3rd gear WOT "dyno pull". Passed a semi and the bounce off the truck back into the car was REALLY LOUD. Oh well, good thing I'll be wearing a helmet and earplugs most of the time at the track.
Will have video footage when I go to GingerMan Raceway for the weekend.