Welcome,
Well the Audi 1.8T or should I just say the 1.8T as it is used in all the VAG range is well catered for and just a chip on a late A4 B5 will get you 20 around 210bhp. After that you are looking at larger Turbo's like K04-15 which will get you 240bhp then GT28RS (300-330bhp) and upwards.
The engines are good for around 320bhp before you need a set of Rods.
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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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