They might not seem loud, let me assure they are. There are no baffles or sound attenuing materials
Biggest difference to normal TT pipes is that it has more of an rumble and more pleasant tone on higher revs. Riding wise there does not seem to be any torque loss and the rev limiter comes in awfully fast....
I have an slight hesitation from idle to 2K, I'll try to close the idle mixture a bit today (155 mains, 45 pilots , drilled slides, 1 shim all unwanted crap out with pods).