So apparently you need one of these things to ride off road in Illinois and I'm just not exactly sure which one to get? Or what one is legal or whatever the &%$#@! out here..Can you guys link me a cheap "legal" so I can ride off road Spark Arrestor. It'd be greatly appreciated, and do you have to reject after you put this thing on? Thanks a lot! Bike: 2006 DRZ400s, exhaust stock, carb stock.