I bought two Magnaflow resonators to replace my existing AR20 resonator and an OEM resonator on my M3. My setup eliminated about 90% of the rasp. I don't really mind a rasp, but I was looking for a deep exhaust note. Now with two Magnaflows the rasping is completely gone and I can hear the deep exhaust sound. The Magnaflow finish isn't as good as the AR20's chrome finish. However, it is still stainless steel and should not rust.
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