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Does anyone know where I can purchase one old RS4 style 18 inch wheel for my B5 S4? The car has four of these wheels fitted and one of the original 17 inch wheels as a spare. I would like to have the same design and size of wheel as a spare but also I want to rotate it with the four 18 inch wheels, ...

Ok, for the record I found the problem.

It was the Y shaped pipe on the throttle body. There was a split which would remain closed until 4000 rpm when there was sufficient boost pressure to open it. Just like a dump valve.

The car goes like it should now.

It happens at the same rpm in every gear gear, just more severe in the lower gears. I was trying to find out just what happens mechanically at 4000rpm. Such as cam timing changing or something to do with boost. Any ideas welcome. This car has been chipped, I assume it's not normal for an S4 to do th...

I have just test driven a very nice S4 Avant which I am considering buying but I have one reservation. At 4000 rpm on an open throttle there is a very noticeable clunk or bump from the engine. Worse in 2nd and 3rd gear. Does anyone have any ideas what it could be? I have asked the seller to have it ...