The p2074 is due to your maf sensor being off because ******* does not have the tunes adjusted for the nl stage 2 due to it being a 5" tube. Just wondering if your running sotf with your tuning? I thought I had seen the p0000 code was due to the sotf switch not being properly connected and the other one is due to cact circuit issues which would lead me to think those 3 are due to an improperly installed sotf switch as it plugs into the cact wiring.