well i went b series after 2 d series and now i want to do a n/a build. but i have a b16, and i want to do a skunk2 tuner stage one or maybe a stage 2 cam set. but i wanted to know if i should upgrade the Valve Spring and Retainer on the motor, also what ecu should i run i was thinking the p28 chipped, and whats the best place to get the motor tuned?