Depending on what map you go for will determine if it's worth your while.
The benefits of the FMIC are that it will keep the intake temp way down and Turbo car love cold air. The SMIC works well with stock setup and can cope with a mildly tuned K04 but hard driving can heat soak the SMIC and cause you to loose power as it raise the temp of the intake air which mean less power.
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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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