This week end I installed a Y pipe on my cali spec 2k 5 speed. It fits well, is centered around all the braces and tunnel, but on a hard launch it will "clunk" around in the tunnel right below the center consol.

Anyone have this happen?

the hanger is in place, and goes from the top of the pipe to the rubber mount, with a good pre-load (I lifted the B pipe about 3/4 inch from the cross member before snugging up the hanger).