When I bought my original CT70 it came with a short homemade STE which I removed. I tried fitting it the other day to my clone bike, which is fitted with a Lifan 110cc engine. It sounds really nice and more like a 250 two stroke with the exhaust fitted. Am I going to mess up my engine leaving the pipe on there? It's made from a CT low level pipe I think, and is about 18" long, it terminates in line with the rear wheel about 4" ahead of it.