i have seen results of a GOOD ecu programmed and it has improved performance aswell as economy... plus a fully programed ecu will make the improvements from the exhaust and intake more noticible
A forum community dedicated to Subaru Impreza and STI owners and enthusiasts. Come join the discussion about performance, engine builds, exhaust, modifications, troubleshooting, maintenance, and more!
okay, that's probably more fuel economy than you intended.
