300exguy125
07-01-2007, 07:23 AM
a while ago when i got my wb exhaust it came with a filter it had a spring in it was i supposed to use that because i put in the other thing from the stock filter then just yesterday i had another filter i got from a guy who races and he had the spring in his and it was used so i took it out and out it in mine i pretty sure thats what its used for
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