Any body know how to unlock 03 Q45 ECU. Installed straight pipe from header back with K&N air filter

to NICO! I've never heard of anyone re-flashing or otherwise modifying your series of ECU, but perhaps someone else will come along who can point you in the right direction.

When it comes to tunes, the only option I know of is Uprev (https://www.uprev.com/secure/). However, their software only works with specific ECUs, and I believe the one you need will have to come from the 2003-2004 M45.

I don't know exactly which part number you'd be looking for, but perhaps speaking directly to UpRev might get you sone answers. Maybe they can even unlock all ECUs by now.

Keep us updated.