Hi there,
Its likely that your RS4 is abit faster than the other Guys Standard RS4, as the Milltek Exhaust System is meant to give you around 20BHP extra, I doubt that the K&N intake would make much of a difference though, from my experience, they make your Car fractionally slower, as they alter the Power band/Rev Range slightly, people just think there faster, as they enhance the Cars engine noise. I think it could be possible to be close to 4.4 on a 0-60, with a Milltek,if you got the Gear Changes right.

 

But doesn't the Intake promise 12 extra ponys? But I can see your point that it might interfere with or corrupt the twin-stage intake system. I think I should take it to the track but to be honest I feel like I'm going much faster during takeoff than when I was during the bone stock times.