I am going to be racing an enduro in a few weeks. In the flier, it said spark arrestor required. My bike does not have a S/A silencer. This is mainly for the SERA guys... how strict are they about this? I think it would be difficult to check all 400+ bikes. I know that I have to get a real S/A before long, but I am short of funds at the moment. Do you think I should try my hardest to try and find a cheap, used S/A for my bike, or should I be okay for now? Thanks!