I do know this. They will make your sled sometimes not start with out holding the throttle open just a little when engine is warm. I felt no gains and was concerned about how long the reed petals last because when on a riding trip you wont be going to the store and buying them over the counter. I have read that they will not last near as long as the stocker. If you only get a couple of horses is it worth it?? The firecat is the only machine that I know that they dont work that well in. Cats disign is hard to beat on this one just like the exhaust system IMO.
PS on my banshees they are worth it because they make a noticable improvement.
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