Interesting things are afoot with the Environmental Protection Agency (EPA), as the governmental body is seemingly under the impression that it can regulate the modification of racing vehicles that were originally made for on-road use. As such, the EPA is looking to update legal language to solidify that opinion. If granted, this would mean that any production-based racing series, both cars and motorcycles, would be subject to EPA emissions regulations, and as such aftermarket modification to those machines would be greatly reduced. In essence, that sport bike that you take to the race track, whether or not it ever spins a wheel on the road, could be deemed illegal if you modify it from its EPA-certified form, i.e. add an exhaust, intake, etc. Needless to say, this is causing quite the stir.