SEmerson, a buddy of mine just put together a set for a guy. HTT 62/12 on top, standard s400 on bottom. The guy is running a stoopid pump, and the turbos light at about 1500rpm. It depends on what you're looking for. I hear a lot of good things about the s300/k31. Towing, drag racing, or daily driving? I think it would be a lot cheaper to set up a set of your own. - Buck