51908B 1/8 Scale RC Model Alloy Blue Adjustable Exhaust Pipe Muffler Two ChamberTwo chamber exhaust pipe with adjustable inner chamber. Splits down the center, the inner chamber is threaded allowing the fuel outlet to be positioned wherever best suits on the exhaust. Inner chamber features several holes (see picture) with adjustable inner piston allowing you alter how the exhaust performs and uses the second pipe. Measures 179mm long end to end.