DPF ON: Noticeable power increase, very nice trans tuning, better than stock. A little better MPG, but it's not huge.
DPF OFF: I hear what you are saying about stinky and noisy. It's not all that bad and the power improvement and MPG is noticeable. Picked up a solid 3mpg around town, haven't had a highway run yet, but I expect it to be about the same.
The diesel stink is there. A little smoky too.
The sound is not noticeable until you stomp on it, then you know you've lit a fire somewhere. There's an underpass right where I hit the on ramp. I can hardly resist thundering by some slug that's been holding me up. It really roars at WOT
Their support has been stellar.
I have a dyno appt set for Friday and then we'll see just how much power it really makes.
As you already know, the KEM tunes get the 'big avoid'. Driveability issues, lousy mpg and little to no support.
The Spartan is getting some good press lately. There's a thread around that reports nearly 500RWHP and 1350TQ! (DPF Off) Supposedly the newest update fixes the no-pyro complaint too.
2012 F350, 6.7L Diesel, 4x4, SRW, Crew Cab, Short Box, Loaded, Ingot Silver
Detroit Truetrac, Icon leveling springs, steering damper mounts, King reservoir shocks and steering damper, Ultra Predator 22x10 and Nitto Terra 325/50R22 (35"s), H&S Minimaxx & Gearhead, aFe 5" SS w/ muffler, Leer XL, LineX, Titan 50gal, Airlift bags and wireless.