Bumpers & Skid Plate Qs???

I got new front and rear Kimpex bumpers for my Vinson in yesterday....I was wondering how hard they are to install and if anyone has had any problems with them?? I heard something about the exhaust hitting the rear one after installed, is this true? They look fairly heavy duty and simple to install....we will see. If any of you are interested in bumpers the Kimpex ones are the way to go....they cost me $59.95 a piece from ATV Direct......Suzuki wanted $125 a piece for theirs!!

Oh one more thing....I also installed an aluminum skid plate for the entire bottom of my Vinson and at low speeds, the vibration of the quad seems to make the plate make an annoying vibrating sound....have any of you encountered this problem and how would I correct it??