According to Twinair's website the filter did change in 07. The 07 onwards part number is 158046FR which incorporates a laminated layer of backfire retardant foam. Prior to that the part number is 158056. Summit racing quote prices of $36.95 and $28.95 (ouch!) respectively. I think I will take good care of the 1 I have from now on!
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06 Gas Gas FSE 450 USA
07 Gas Gas FSR 450 UK with motard and dirt wheels
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