i've seen quite a few twinloops have this problem, there was a bad batch a while back
Originally Posted by SHU-ES1
I'm assuming the quality of the muffler isn't an issue because its both X-Force HiFlow Cat and TwinLoop Muffler. There product quality is quite reasonable.
The YouTube clip I left was of my 5+ year old Apexi N1, and when I removed it and shook both the resonator and muffler, I could hear the muffling materials all broken inside and as well as falling out in little bits so that's why it was so horrible.
Love the sound of it now though! Money well spent! Even though the Vi has no guts to go with the sound.
does your cat have a heat shield welded to the body?
check if that's rattling, mine came loose on the weekend so i took a piece of wood and whacked off the plate, problem solved
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