51mm Motorcycles GP Stainless Steel Exhaust Pipe Muffler Extension Spring For Yamaha Description: Hand pipe welder scale, shape coarse ore 304 stainless steel,glass fiber cotton Finish:stainless steel,imitation titanium If modified front, front-end interface to 5.1 cm can be inserted directly installed If no modification front can be original after resection, and then the soldering of this product,recommended above 150CC Sound characteristic: the same posterior segment, loaded with different brands of engine displacement, loaded with different sound different displacement engine, the sound is different. Specification Overall Length: about 38.3 cm Interface Diameter: 5.1 cm Exhaust muffler core diameter:4.8cm Package Included: 1 X Motorcycle Exhaust Pipe Muffler