unless you are running ridiculous bhp a decent panel filter in the original airbox is 100% better than an induction kit.after running a few track sccobies i soon learnt that induction kits on un-mapped cars spell trouble as they mess up the flow through the maf and can lead to running lean on boost then boom...
the same with dump valves.they make the car run rich between gear changes and when you think the guys that designed these cars know best so i always stick to whats best.