Any here running the Hot Rod 370's from Don M at Formula 1 Diesel? I have the 435s right now and its too smokey, and gets 16 mpg if I am nice to the skinny pedal. Did some searching and all I could come up with is the DDP 3's and 4's. How do the DDPs 3 and 4 compare to the Hot Rod 370s? I would like to get some more mileage and I think I have plenty of fuel for my setup. What you guys think?