MOPED ARMY

"This pipe":http://cgi.ebay.com/ebaymotors/MINI-DIRT-BIKE-BACK-EXHAUST_W0QQcmdZViewItemQQ_trksidZp4634Q2ec0Q2em14Q2el1262QQhashZitem5630fcd936QQitemZ370189064502QQptZOtherQ5fVehicleQ5fParts#ebayphotohosting

Lets pretend it didn't have a kink in it that might pinch the exhaust flow all the way down to almost nothing, what kind of power band would you see on a pipe like this with almost no header? Would it be strictly low end like a circuit, only more so? I am going to buy one for shits and giggles and toss it on an express or something.