i ordered the 2 Piece Muffler "Poo Poo Pipe" Deluxe exhaust from bicycle-engines.com for my 49cc four stroke and it definitely wont work because it wont align up with the exhaust port on the engine since the exhaust has a weird bend in it and it hits the in frame mounting bracket. im going to call bicycle-engines.com and complain about the exhaust that i paid just about $50 for and it doesnt even fit. Does anyone know of a good exhaust? im definitely sending it back and demanding a refund.