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Message: [QUOTE="powerlifter405, post: 711242, member: 2044"] That was my guess when I was looking at the maps but i'm still eager to learn more. Does one need the other? Cam vs porting? are they independant combing to equal a greater sum than each individually? Now that you say that, how often for a DD application would a 7.3 see above 15lbs of boost? Aside from excellerating hard, under a towing load, etc.. When I"m empty just driving a long, I can't recall my 38R producing that much unless I was really in the pedal. The same thing for my 6.4. I can keep that under 12lbs all day long unless I get on the go pedal. So your saying overall airflow, lbs/min of the 4202/35 would be similar to the 71mm 4294? But the gain would be a larger map, come on sooner, last longer, w/ lower drive pressures? Just when i thought I had the most basic grasp of things, I get kicked in the nutts :doh: I really wish there was a simple way to plug in the data but maps and info is scarce so i doubt that would ever happen....... Back to fantasy land... After looking at the Garrett maps and seeing others w/ similar setups I figured that combo would give me great off idle response with minimal throttle input plus plenty of mid range 1800-2200 rpms on up. My rpm goal is to be at 70-75 mph on a 32-33" tire w/ 3.55ish gears @ 1800 rpms. Highway speeds are 60-75 around here and my 02 7.3 was fine loping along at 1500 rpms so I'd like to use the natural torque band of the 7.3 to keep me moving vs higher rpms, when i'm a road trip. My hope was to have plenty of air moving to burn what fuel is there=mileage/efficiency and prevent any lag when I need to slowly accelerate. Flooring it will get most any resonable setup going but I don't want to have to floor it it and i don't want just a "reasonable" setup. i want a solid, quick with minimal input when needed type setup. [/QUOTE]