I'm gonna run a foam air filter on the buggy when it gets to that point. Accel makes some good looking black ones, 14" diameter, various heights. My question is, these are considered "hazardous", have an extra shipping fee, and must be shipped ground...why? If they're flammable...so is the cardboard box they come in. Also, should I be worried about a backfire or something torching my filter if this is the case? Also, anyone know where I can get a black, open element air cleaner that doesn't look goofy and isn't $150?