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I'm getting a new flowmaster muffler with a dual exit and dual tailpipes installed tomorrow. I'll let you know if I notice a difference in performance and sound. This is all for $275
I got a dual-manifold back system with glasspacks from a local shop for
$225. There isn't much of a power difference and only 1 mpg difference but it sounds great (my opinion, some people don't like glasspacks)