turbo 138ECU Remapping for Fiat 124 Spider 1.4 MultiAir Turbo 138 bhp. Gain 51% power with a Stage 2 petrol Tuning. Chip Tuning options available, Rev limit removal.ECU Remapping for Fiat 124 Spider 1.4 MultiAir Turbo 138 bhp. Gain 51% power with a Stage 2 petrol Tuning. Chip Tuning options available, Rev limit removal.