The Pypes mid mufflers, Street Pro's, or the VIOLATOR duals will save you some money over the FRPP duals, but you will sacrifice sound quality. (Pypes makes LOUD mufflers....but I think the FRPP's sound is a better tone) Performance between duals, and a free-flowing SINGLE aftermarket muffler when naturally aspirated is debatable. F/I applications shows the best gains with dual systems and an X pipe from what I have read. So that might be something to keep in mind if you have F/I plans in the future.

Personally, I would go with the FRPP duals.....they leave the door open for F/I down the road, and they SOUND and LOOK great.