Hey, I purchased a muffler from china, to save money, and turns out it isn't a slip on. The ending diameter of the exhaust it 2.5 inches, and I need it to somehow slip onto the 1.5 inch exhaust pipe. I bought it here Motorcycle Exhaust for Honda CBR 250 & CBR250RR. If anyone has any tips at all on how to hook it up, I would really appreciate it. Preferably in-expensive.