1. CEL will be on for sure as you'll not have any cats.
2. Dinan X-pipe is considered as "racing part" from Dinan which doesn't have any warranty to begin with.
3. Dinan racing software is also consider as "racing part" and no matching warranty comes with it.
My dealer was cool with it but it's really up to them to warranty it or not since it's not covered from BMW or Dinan's warranty.
PAST: 14 F10 M5 | 11 E70 X5M | 08 E90 M3 | 08 E92 335i | 03.5 E46 M3 | 99 E36 M3