I don't know if the DNA filter is what's made the bike so lean, but I have a K&N version I could try. Unfortunately, each dyno run takes about 3 hours of my time and �35, so I could spend a lot of money swapping filters and blocking the air intake before I get any safe results.

Pleiades could be right that the O2 controller alone would sort my problem, but I'm looking for Kev to spot this thread before I take any action. If I spend �70 on the O2 controller, plus another �35 on a dyno run, and it's not solved the problem, I've spent �100 of the money that could have gone on a PC and custom map.

If I could find a used snorkel online I'd go back to stock for now, but it seems people must hang on to them. I wish the previous own had kept the one from my bike!!