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I have no rasp with my Solo HFC's but I have the MRT V2.0 axle backs. It gave the V2's a little more deeper aggressive sound. You will get noticed when you get on it but quiet if you drive economy style. I haven't got over the price that I spent on them but they did make it sound better. I would have suggested you started with a muffler delete first to see if you like the sound since the HFC's will amplify it a little.
Dean.
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