I also have these pipes. Got a CEL once and it went away after a couple cold starts and some miles. Great sounding setup paired with the OEM back box or Akra. I swapped out to the Akra Evo pipes yesterday and I'm not sure which setup I like better.
2009 BMW E92 M3 | Jet Black / Fox Red, Extended - SOLD | Akrapovic Evolution - SOLD | MS Filter | StopTech ST60 / ST40, yellow | KW CS | 90mm stud conversion | 18x10F 18x10.5R HRE R43, Continental rubber | IND appearance package incl. key delete | JL Audio 10W6v3 (2) / HD700/1, Technic's harness