Looking at the size of the rear muffler, it isnt really big anyhow so i dont think it would do a lot of dampening.
the factory exhaust is quiet because of the rear muffler, which was a turbo design (ie: restrictive).
As i said before, worse case scenario put a twinloop muffler on it, and it should kill the noise (at least at lower rpms) I reflashed someone from SA with PLM healders, high flow cat into a straight thru 2.5 inch (no resonators) into a twinloop, under 3k rpm it's very quiet.
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