I actually like that pipe, but it won't make any more or less power than the slip-ons. The nice thing is that the baffles are removable, so you can trim some off the end, slip them back in, and the bike will sound better.
It is hard to beat the slip-ons on a Stg1 03 Vegas, you'd have to go with an aftermarket 2-1 and spend $700 for just a few HP. There are far cheaper ways to make power with that bike.
The Vic Shop, Inc