Sachs manufactures their own dampers (they are OEM supplier for Volkswagen
and others and make dampers for Ferrari F1 and McLaren). I believe they buy
their springs from Eibach.
These springs have some progression. I was thinking of other racing springs
as well. I know a A3 owner with Sachs Performance who has bought some stiffer
custom made springs from Eibach.
Rex, I'm wondering about this. When I adjust the dampers to 15 of 20 clicks it's too
hard for my taste on the Nürburgring Nordschleife. Even in the middle of the range
it's very hard on country roads. It's much stiffer than OEM or the very popular H&R
monotube coilovers. But I never had the B16 in my car.
Maybe the situation is little different because of my verx stiff 28/24 mm sway bars.
Nevertheless I like the Bilstein suspensions as well. We have a B12 kit in our G4 TDI.
Don't misunderstand me, I don't want to say Sachs is the one and only and I don't
know the B16 on the Mk.V GTI, but this seems a bit strange to me.