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I bought an Akra slip on over a year ago and I couldn't be happier with the system. It's very easy to install and has a nice deep growl, but not too much as I do have an E93. However, I picked up a Akra x-pipe since I've had to itch to do it and will put it on soon. It will likely make it a little louder but no too intrusive I believe. I get very little drone at the 2k range currently and the weight savings is a plus. I didn't go with Dinan because two of the outlets are dummy outlets on the muffler. Just seem like a waste to lose two outlets.
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