Kinda ghetto fabulous, but I heard a customers leased m340 with the muffler replaced with straight pipe. Cost him like 200 bucks at a muffler shop and he saved the muffler to put it back to stock.
It sounded really good but I'd imagine it would drone for sure. If you're doing a downpipe taking off the muffler too would be too much as it would be straight through with nothing quieting the system down.
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