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Originally Posted by LiquidInfinity

My cat-back occasionally would bounce against the crossmember (being reinstalled in the attached pic, courtesy of: http://www.gmhightechperformance.com/camaro/tech/1009gmhtp_2010_chevrolet_camaro_catalytic_converte rs_headers_intake/photo_19.html):

We just used stainless steel washers to space it out a bit (the kit in this pic came with spacers).

Just another thing that could be causing the sound (or likely will in the future after driving it a bit).

-LI-

I installed mine myself also and this was also the problem. Same deal I used washers.