Ok so I got 2 mx bikes that I ride GNCC style courses with... I need spark arresters for both of them temporarily for now until I can afford the whole silencer for the 2003 KTM 250sx and the exhaust system for the 2011 YZ450. Will the GYTR spark Arrestor for the 2011 YZ450 work with the stock exhaust system? Or am I going to have to fabricate my own spark arresters? I don't feel like spending over $150 for a end cap that could buy a whole silencer for the 2stroke! I need a cheap TEMPORARY solution for one event with both bikes.