I have a '04 6.0 F-250 4x4. Thinking about exhaust ( turbo back), guages, aftermarket intake elbow and zoodad mod. What would be the best and safest programer to go with these mods? Want to improve mpg,turbo-lag and gain a little hp and trq but don't want to have a programer that will boost my heads right off the block . Prefer one that will scan codes and calibrate speedo for bigger tires and lower gears. Thanks for any advice.