I have ThunderBike Pipes and they sound Just right at Idle to @ 1/4 throttle they have a Deep Mellow manly sound. After about 1/4 throttle to full throttle They proportionally come alive, not obtrusive but the cagers know your there.

05 TBA Mulberry/Silver, Thunder Bike pipes, K&N single Filter, 132 main Jet's, Snorkles Removed