yeah the stock turbos [KO3s] are known to go out all the time [specially if chipped and/or driver is just hard on them] and on the S4 you have to pull the engine to replace. on these cars you better be very DIY inclined or have some deep pockets because parts aren't necessarily cheap and labor will rape you in the bum bum. what most people do is go with the K04 turbo[s] out of the RS4 which are much better and also make quite a bit of power ;)
both the 1.8t and 2.8 are VERY good engines. the thing is that 1.8t is pretty particular about its maintenance & if it didn't see regular oil changes [specially the early 1.8s] it does tend to build up sludge.
[IIRC] power wise the 1.8t pushes 150hp, 170ish if its the later model. the V6 has 170 for the 12 valve and 193 for the 30v. but if you plan on installing a chip you can raise either of these motors to about the same power [~210]. you might be able to gain 5hp more with exhaust/intake out of the V6 but for more you'll be looking into F/I; whereas the 1.8t has a lot more room to grow so if you are looking for big numbers the 1.8t is the way to go....
both the 1.8t and 2.8 are VERY good engines. the thing is that 1.8t is pretty particular about its maintenance & if it didn't see regular oil changes [specially the early 1.8s] it does tend to build up sludge.
[IIRC] power wise the 1.8t pushes 150hp, 170ish if its the later model. the V6 has 170 for the 12 valve and 193 for the 30v. but if you plan on installing a chip you can raise either of these motors to about the same power [~210]. you might be able to gain 5hp more with exhaust/intake out of the V6 but for more you'll be looking into F/I; whereas the 1.8t has a lot more room to grow so if you are looking for big numbers the 1.8t is the way to go....








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