Spartan or H&S

6.4's are common rail aren't they? ;D

my buddy is looking to do something with his 6.4..i think ill steer him to SCT

I run Eric's tunes in my truck. Last weekend I went to a dyno with the plow truck, all I have is a SCT with his tunes, a DPF/DOC delete, and a S and B intake. I made 624HP and 1238TQ...well, the dyno said that's what I made (optimistic). The second highest power in the stock charger class was a D max that dynoed 60 or 80HP below mine. Their was also a 6.4 with an upgraded large turbo, a fuel system, injectors, propane, and a HS tuner. I made 15 more HP then him on the dyno. Their was also a new Ford 6.7 with an HS tuner and a DPF delete. The 6.7 only made 380HP... Granted the 6.4, and the 6.7 were both on 38's, IIRC, they didn't seem to perform that well. I'm sold on Eric's tunes.