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 took a 1.125" hole saw down the center and removed the last stage baffling. Better sound (not loud at all and hardly noticeable on the highway) and no noticeable change in performance which I suspected.