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@bq
Back in the day air con compressors sucked so much power from the engine that you could hear the revs drop when you pushed that button. You've got to remember that even a 'fast' car like a Golf GTi knocked out about 118bhp because cars didn't weigh anything, and the drag of a compressor took a lot off that, especially as most were huge things designed for American V8s. On a modern car (Mk7 Golf has 229bhp) with smaller kit it's not really an issue.