If you're planning other performance mods such as exhaust, flywheel, throttle body etc etc, it's best to hold off, because the ECU needs to be re-tuned everytime you make a change which can be costly. However, if you don't think you'll be doing anything else for a while - go for it. Basically all you're doing is optimising the engines settings Sport1vo - I'll try to make it Saturday, maybe see if they can fit me in for a run too.