I've removed both the cat and centre muffler to reduce EGT's. It has a positive effect on the performance in regard to the turbo spooling slightly faster, but other than that it only results in a better sound and lower EGT's.
It is actually not super loud, but if highway driving a lot one might consider a hot dog. Some people have replaced the centre muffler with a high flow sports turbo muffler.
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