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I have the M-Performance exhaust and I'm disappointed. I port installed so I have drove my 335 with the stock exhaust, but it's pretty quiet (or not loud). You get a burble if you on the power above 4k rpm on sport. Or if you're on my driving very slowly in M1 or M2 off the power.
But, I paid less than $1k, so can't really complain.
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