Not when accelerating, the opposite. When driving without throttle the buzz sound appeared. Any other Plus 4 SS experiences about this issue? I talked to Günter who shares the same experience. Yes I´m aware that on an aesthetically level the pure manifold looks much better. But the increase of torque plus the suppression of buzz justifies the wrap around. It´s an issue between 3K and 4K revs.

'14 4/4 graphite grey