so, just had my S3 remapped (AMK) and the diagnostics threw up a mechanical fault with the N249 but we went ahead with the map anyway. The geeza who remapped it swears by the N249 and says I should replace it. I mentioned that loads of people bypass it and he claims there's very good reason Audi put it there in the first place, to help control boost, and that I should keep it. I've seen a few threads and everyone seems to think it's deffo worth bypassing but I just wanna be clear. No one seems to have a proper reason to keep it or indeed to bypass it. Also, the guy rekons that the standard 3bar fuel pressure regulator will provide enough fuel for up to about 290 break and that other tuners upgrade em to 4bar anyway just to make a bit extra on the side. What do you guys make of all this? What should I do!? Also, even if I do bypass the 249 do I still need to get the fault cleared on the diagnostics? Thanks guys! All opinions appreciated!