junster...i dont know how to post up sites, but, if you go on ebay and type in 'mini pocket bike exhaust' they will come up....i was told by a dirt bike guy to put my small one on the 50cc and the large one on 80cc...he said they would be tuned better...i look at it as it costs 36 plus shipping for a poo poo pipe, no expansion, and this costs me 19.95 plus shipping...i just bought a dual exhaust for 13.95 plus shipping,,,nicer than the single...they also have a single like a poo poo for 8.95...they sound great and nothing is blowing in your face...the only thing i had to do was add about 1 1/2 inchs to exhaust connection to set it...and it set perfect...hope this helps...Dennis
http://shop.ebay.com/items/?_nkw=mini+pocket+bike+exhaust&_armrs=1&_from=R40&_mdo=
http://shop.ebay.com/items/?_nkw=mini+pocket+bike+exhaust&_armrs=1&_from=R40&_mdo=
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