Im not sure exactly how much boost a stock '00 S4 puts out but thats not really the issue. I don't have a boost gauge but will be getting one next week. If only one turbo was working would I know it? Would it be putting out half of the boost? Say a stock S4 puts out about 10 lbs of boost.. if only one turbo was working would there be 5 lbs of boost or would the car run like crap because it needs to two turbos to function properly? Boost Gauge question also: I love the way boost gauges look on the A-Pillar, what do you guys do if you have the air bag there? Do you still put a gauge there or is it a must to find a different place for it?