I pick up my 540i next week and also been looking at tuning packages for it. Ive used DMS before on my 335i, they are one of the best around and really know their stuff, they are expensive however, but i managed to get a last min cancelation for like £600
The NMV option looks good too, £1400 for stage 2 and i think they quote 450-460bhp
DMS will get a decent figure but i always hear that their dyno figures are slightly inflated
im planning on Stage 2, but ill get a downpipe off ebay and get it fitted locally then get it remapped, should be cheaper that way, but im not sure who to get it mapped yet
NMV are quite far from me, like 2 hours where DMS is 1 hour
i think DMS charge over a grand though for a stage 1 remap which i think is over priced, im tempted to go with Evolve automotive or Wrench motors, they both do some of the fastest bmws around at the mo, if you watch any of the youtubers you will see their builds, they charge £600 for stage 1
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