It's a strut brace.
It reduces chassis flex by preventing the tops of the suspension turrets from compressing towards each other.
Usually cost £50 for an ebay special to silly money for branded ones.
It certainly can't do much harm on your car.
Ive just been looking on ebay and it says youve got to remove the standard air box and get a induction type filter. The one in the pic up top is in the wrong place, will just be sucking in warm air loosing power
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