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I installed a set of slip ons last weekend, not sure what brand they are, however the muffler has the same shape as the stock muffler, with the addition of the Fish tail tips.
The difference is noticeable. Apart from being louder, it's like the motor has come to life. I do not know for certain if the motor is stock, I know it has been apart a couple of times, and it does not have the stock pistons. I also suspect the cam has been changed.
The motor will now rev a lot freer, and is a lot more responsive. Haven't got any dyno figures, but the "seatopants" dyno says there is an improvement.
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