SCL

<center><img src="http://pictureposter.audiworld.com/100685/dsc02521.jpg"></center><p>I sometimes hear a small air leak when under boost. I think it is coming from here. Has anyone had this problem or know what parts to get and how to replace this stuff? The clamps are crimp-ons. And it's not easy to get in there.

In the bently diagram (link) this is items 4, 5, 6 and 7.
4 - Evaporative Emission (EVAP) canister purge regulator valve -N80-
5 - To connection on intake manifold, lower Throttle Body (TB) flange
6 - Check-valve
7 - To crankcase housing breather<ul><li><a href="http://pictureposter.audiworld.com/100685/fuelinjection-components.jpg">http://pictureposter.audiworld.com/100685/fuelinjection-components.jpg</a</li></ul>

S4-Fireblade

The "leak", if it exists will probably come from other place than that.<ul><li><a href="https://forums.audiworld.com/s4s6/msgs/29825.phtml">https://forums.audiworld.com/s4s6/msgs/29825.phtml</a</li></ul>

Bill the Cat

As well as some pics in my poster.

2 tips &amp; you should be on your way -

Remove the boost hose from the TB.

Use a dremmel tool to cut the old clamps off. Use new Ideal clamps to assemble.

See my pic poster for how to test the old valve out of the vehicle.