I just bought my new baby..an '06 and although my wallet is kinda empty I'm always looking around and planning on mods down the road. So...the wildest I usually go is a full system but generally I stay with a slipon to save some cash and because I commute, ride on the weekends, and a few long trips every year. I wanna keep good reliability, range, and rideability. Based on what I've read generally people go with a slip-on, a PC3 or similar, and a TRE...in that order. Is that correct ? Can I get a TRE on a bone stock machine prior to a PC3 and slip-on ? Any help would be appreciated...thanks.