<center><img src="http://www.teraspeed.com/RS4/S-mode.jpg"></center><p>

... adn to open them up, I just disconnected the vacuum lines. Is this same approach work on the RS4?

So the only way to get max sound is to punch it above the 'keep open' threshold when accelerating?

It's exactly what I thought: Some have posted that Sport mode makes it easier to launch, easier to shift, easier to rev-match, blah blah blah. Just look at the plot. Sport mode DECREASES your control of the throttle by DECREASING your control of torgue over a narrower range of throttle position. For example, with sport on, throttle positions between 35% and 80% all result in engine torque of about 95%. What that means is that throttles between 35% and 95% are all the same - numb!

With sport OFF, throttle positions between 35% and 80% result in a useable torque range of between 70% and 95%. This is the definition of CONTROL - the exact opposite of sport mode.

This is why I've used Sport Mode maybe 5 miles in 10,000. Just remove and plug the vacuum lines to your exhaust flaps and you can have it all.

Sport mode is little more than a marketing gimmick no different than BMW.

I believe the noise emission regulations are looser than ours.