With this truck driveability is the key for me. Id say on sw 2 or sw 3 somewhere in there, you wouldnt see a power diffrence, just faster spoolup. To all of those who are looking for a good street manner truck, go smarty. Its been proven time and time again that in high hp cases the smarty dose effect the peak numbers. I think its very simple, if you want to dyno, pull the smarty. I'm very impressed , i've started the ordering process on a set of mach 7's and a south bend DD. I think its very impressive that we see this kind of number out of a single truck when a few other local trucks and trucks very close in setup dyno less or numbers not much more than this. With the bottle, we could see some very good numbers!