The soundproofing in these cars is very good, so the exhaust will sound much louder outside. It's night and day in my E93 with the top down and my oem mod. With that said, in my past experience, to get a really aggressive sounding exhaust, you need to lose the cats. Once you do that, you will probably be glad for the quiet rear section which should hopefully tone down the rasp. Good luck, modding is addicting for sure, it never ends...
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