I went with the Magnaflow 3 inch muffler and 3 inch mandrel bends. Got it all welded up at a great local muffler shop and hit it with high temp flat black. In CA the cops are on to the big shiney exhausts.
We stay away from HP estimates because there are too many variables. You need to let us know what you got Rick because this forum is based on real world applications and facts from people like you and me. Seriously, let us know if you notice better spool up, less taper up top, loudness, etc. Tell us your impressions. That's what people really want to know. :thumb:
Take some pics too because HKS makes some really nice stuff.