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You say that you've checked all the boost hoses, but have you checked all the vacuum lines too? If they are original I'd replace them all as a precaution. The hose you can get from GSF for about £3/m and you only need about 3m.
Where abouts in the UK are you?
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1991 Audi S2 3B - 2.5 Stroker engine
1997 A6 2.5TDi quattro avant - C4
1976 RD250E / 350LC cafe racer
I can't remember how the S4 is piped up, but to check them on the S2 I take them off the 3 nipples on the inlet manifold and put pressure down them with a blow gun on the air line, set to about 1bar. Then listen for leaks, don't forget to check inside the car for the lines than run to the ECU and the difflock.
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1991 Audi S2 3B - 2.5 Stroker engine
1997 A6 2.5TDi quattro avant - C4
1976 RD250E / 350LC cafe racer
Its funny you say that because i had a car full tonight and i caould swear i could hear a swooshing noise coming from near my feet which coincided with the turbo boost, not loud but there!
Mine is an S6 so no diff lock but there are vacuum lines going into the car through a rubber grommmet.
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The Audi Enthusiast website. Forums for all Audis including A4, S4, A5, S5, A6, S6, allroad, A8, S8, TT, R8, Q5, Q7, 4000, 100, 200, v6, v8, vintage, local forums
RS2'd 93 UrS4 5 spd sedan
94 UrS4 V8 6 spd manual avant
I've just been for a data log thing at c&r enterprises in nottingam, and although nothing obvious n terms of parts came up. The car is running extremely weak!!
Its on its 3rd MAF sensor, new oxy sensor (although a genuine VAG item is comming tomorrow) and last time i checked the fuel pressure was good, altough i'll be checking that again tonight.
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