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Unless you're running a FMIC or MAF-less ECU set-up then the OE filter will do, don't bother with an IK. If you want a lifetime unit then go for a K&N or Green panel. but don't expect any extra power, the gains are +/- 2bhp at most over the OE paper item.
If your fitting a induction kit,don't go for one that needs to be oiled. This can lead to MAF failure.I fitted a powertec stainless one on my last car,with FMIC,and had no problems.