a k&n will give you better airflow, a tip for you though if you change anything from non standard on a 206 dissconnect the battery then re connect it and it will re set the ecu thats wot i have been told anyway,
motor factors for parts, much cheaper than main dealer, but when it comes to brakes i would go for genuine part everytime as sometimes motor factor discs warp
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TURBO LAG IS MY WAY OF GIVING YOU A HEAD START