Building an Expansion Chamber

i bought an 80 dollar exhaust from usa and paid 30 dollars postage to uk it was so loud and less torque and would not rev i then bought a second hand minarelli 50cc exhaust and expansion chamber from a real bike manufactrurer second hand had to cut in 1 place to make it fit super quiet and loads more torque on the lads bike
 
honestly i dont think id ever buy an exhaust , but would be good to know which it was so i can avoid it if i ever do decide to splash cash , also a pic of the minarelli one be good too in case i ever pass one in a junkyard
 
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