Where are you getting the remap done and what sort of power are you expecting? I know that forged pistons are generally considered essential after 225 bhp. With the cars being so rare I struggled to find any tuners. TMC just do tuning boxes and G-Tech are in Germany. I've also heard the multiair is a difficult engine to tune. The electronically controlled inlet valves can struggle at higher power levels. In the end I decided to just make a few cosmetic changes and generally leave the mechanicals standard.