The standard turbo will boost to around 18psi depending on map but most maps will boost a stock turbo to around 15psi now for the engine which off my head I think safe boost is around 20-25psi on stock internals but I would not run a stock bottom end on anymore than 20psi before it will go bang.
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OEM RS4 Body| RS4 front Brakes| RS4 shocks & H&R Race springs| RS4 Xenons| 18" BBS RC wheels| Scroll K04 Outlaw|RaceTec FMIC| Southbend StageIII clutch| Autobahn88 Silicon hoses| Baileys DV| Waiting to be fitted: TT MAF| 380 injectors| RS4 Rear brakes & a Remap
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