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Power Now valve, weird

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The stuff I ordered came in. I ordered a DSP Power Now valve for a CRF250R but instead I got a Scary Fast Power now valve for a YFZ450. Ok, I took my sub frame off and put it on, everything worked fine and you can feel the much harder hit on the bottom revs. Do you guys think I should keep it on? It work's fine, that is just weird.

Does anyone else have a power now valve? How do you like them? I always thought the thicker yellow ones were for the thumpers, but I guess not because I got the dinky silver one.

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