I'm a noob at this and wanted some insight. If you were to turbo an Non-Turbo car that's using MAF system, will you have stalling issues since it doesn't compensate for elevation & temperature differences? How can you fix this? I read this from another forum and got confused. Piggyback fuel unit. It poses problems such as having to manually compensate for temperature, and altitude changes. I for one went the standalone route with my MAS based car and had a local SoCal tuner take care of that. On my MAP based turbo car, it was tuned with a SFMU, EGT, and Wideband. To this day it makes good/usable power without any issues, or having to constantly fidgit with fuel pressure or rise rate.