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Yes it will be very loud. I started out with a muffler delete, then added catless downpipes and it was way too loud. especially during cold starts. Then replaced the muffler delete with a BMW Perf exhaust and it sounded pretty sweet. Now I have the Perf muffler, N55 midpipe(gutted resonator), and stock downpipes(due to Smog). It sounds just as good now as it did with the Perf muffler and catless downpipes, just less raspy
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