actually the weight and the power lose out normaly to a 6 speed car because the gearing of the evo (did they change it for the ix?) forces it to stay in the higher rpms which evo owners will tell you it usually falls on its face. s4 3rd gear is tall and with the tq ends up being a really sweet gear.
the s4 has k04s but runs stock programming. requested boost is the same but due to the bigger wheel iats end up being lower and you end up being slightly faster than stock. but this is also a tip with no vag mods and has trouble as it is.