Quote Originally Posted by robby3 View Post
No I did not as this would reset the fuel trims and recalibrates the throttle body sensors.

Letting it idle for 20 min will set the short time fuel trim (after each 15 mins). Since the filters do nothing in the low rpm (or even at idle) for flow it is better to drive the car and let it learn/adjust all fuel trims. Or is it different on the H engines ?
I believe you are correct as stated by BMC in response to an email I sent to them but I have seen other posts that suggest doing this to get more throttle response. I believe it also depends on the driving mode.