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Fast Bikes had a D675 last season and tried all the various exhaust on it. They liked the sound of the TOR but it gave no gain whatsoever according to them. They were most impressed with Scorpion for gain up to 112 hp. It was generally agreed that the Stage 1 or 2 Arrow was the way to go for the TREMENDOUS loss of weight, upwards to 20 lbs?!?!? Personally, I am keeping the stock system for awhile as I just like the three holes.
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