So i came across this exhaust system in my Frantic searching after my Modified pocket bike exhaust ''Expansion chamber'' cracked at the header, Due to my bending it too fit by force no map gas lol So i went on a search for expansion chambers and since last time i bent the header too fit, it weakened the pipe enough too crack from pro-longed vibration-, and ran into this puppy, it is 46.00$ USD with shipping included it is 16'' in length and 1/2 inches longer than the good old stock black cat exhaust, it consist of 5 1/2 inchs of header tube, an expansion chamber followed by a small muffler, the muffler has no CAT or Baffle, but can be added from your ole stock pipe assuming you have it around some where, i am hoping too get some decent performance from this pipe, For those of you who would not buy it due too it being in the same spot as the stock ''you like the exhaust routed too the rear of bike'', Buy 6ft - 10ft of Heater hose with an inner diameter of 1/2 inch for around 3-8 bucks USD, i did, since its not coming off the header the heat the hose will see will not be above 200 degrees F, The heater hose is able too consistently withstand temp's of 275-400 depending on the hose you buy, since the house comes black with white lettering indicating size brand temps ect, buy some bbq paint, or engine enamel for around 5-8 bucks at any wal mart or auto parts store and paint the hose anyway i want too know what you guys think of this exhaust, i have just ordered it and will update with results as soon as i install it . http://custommotoredbicycles.com/yahoo_site_admin/assets/images/003.10990103_std.JPG '' BLACK EXPANSION CHAMBER MUFFLER EXHAUST,recycles exhaust gasses and pressure for better motor performance. Connecting exhaust flange may need some filing out.Louder than stock muffler but better performance. No Cat No baffle design for non restrictive free airflow! 16 inches long, only 1 1/2 inches longer than stock muffler.$46.00 total FREE shipping included.Mufflers may need to be heated red hot with MAP gas and bent to fit. ''