If you want lope then check out Comp Cams Thumper cams. They come in three levels Thumper, Mutha Thumper and big Mutha Thumper. Plus they have an agressive profile and have good street manners.
Check out this link. It is comp cams site with sound bites for the first two cams. Anyone of these cams would sound awesome with your side pipes.
http://compcams.com/Thumpr/default.asp