I wouldn't bother with a turbo timer, just don't turn it straight off after giving it a thrash, its not very often you come straight the motorway and turn your car off anyway. The drive down your street at 50kmh on light load is a long enough cool down period, Subaru turbos are water cooled so that cool down period isn't as crucial like the old oil cooled units. Can cause problem with alarm if not correctly installed either... But def +1 for a decent alarm system.