Hey I had the tracker installed, as well as the immobiliser. It will not work as standard - the guys at my garage had to cut into a relay to get into the CANBUS to get the immobiliser to work. And there was some funkiness with the ignition wiring. So offically Scorpion has determined GR86 "not compatible" but it is if you have someone install it who is a) a competent engineer/electrician and b) is an authorised Scorpion reseller/dealer. If you're in the North West I can recommend the garage who did mine. Feels good to sleep at night knowing it can't be nicked unless someone came with a flatbed.