i bought my car with mild mods, ran it for 1month b4 it melted the ring lands on number 1 3 and 6 pistons, cause, was a rechipped ecu from japanese tunning company garage saurus, i figured when i bought the car that a tune was'nt neccesary, new motor and alot of headaches latr i got it tunned 1week afta the next motor went in, changed to a stock ecu and made 196kw, trust me get a tune even for piece of mind,