The bumper is actually on the side of the pipe just behind the side number plate. The pipe had good clearance on the side, it was touching on the top. I loosened the 12mm bolt by the silencer and adjusted the silencer down as much as it would go. Its not hitting anymore, but its damn close. We'll see how it goes, like it is now. With the silencers being anodized black now, I would hate for the white plastic to melt on it.