A few people have been scammed on the site, Only use paypal to pay for items for sale by other members. If they will not use paypal, its likely a scam NEVER SEND E-TRANSFERS OF ANY KIND.
I have recently just modified my stock exhaust for a little more sound, simple fix, just use a 1 ft. 3/8" drill and drill four holes at the inside bottom of the exhaust, works great and the exhaust is actually not loud at highway speeds.