The Sno-Stuff Rumble Packs are not interchangeable, nor are the OEM's. The F5 RP has a much smaller inlet bell as well as different internals. It works even better than the F7 RP did though- a good 5hp gain. The OEM F6 canister is the same part # as the F7, so the F7 RP will fit the F6. but it has not been dyno tested yet. Anyone with an F6 in MN want a free Rumble Pack? I can hook you up- pm or email me.
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