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If you have got it, not all Q4's do, there should be a big water bag tucked in behind the spare wheel. Pipe like a garden hose runs forward through the car and bulkhead where it goes to a pump that is worked via a boost related switch I think. Which pumps the water out through a nozzle and onto the intercooler. Like I said, mine doesn't have the water spray which I'm a little ****ed off about.
Steve
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