Workmate has a Celtic remap on his BMW, recons it's the bees knees, however he seldom uses the car and it's limited use has so far been very reliable, he has a friend who had his vw fleet remapped by Celtic for economy and finds it makes a noticeable difference. I have polestar on my xc70 and find it makes the car so much more drivable, but I was after mid range improvement not outright power.
The police xc70 were polestarred to a higher spec than civilian cars and suffered head gas get failiers if my local dealer is to be belived.
You pays your money and makes your choice but any and all modifications I make to my cars are notified to the insurance companies, even down to a change in tyre size on the landrover. I hope never to have an accident, however if I do I want to know I'm covered.
Paul.
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