FMIC - brings intake temperatures down (cold air is more dense, so you get more air in - therefore more power) 3 options currently... APR, sharkie's sale in another thread here and making a custom one.
TIP - Pipe from airbox to turbo, original one can collapse under boost, no power increase, you just might not lose some at top end - Forge and some others make these.
CAI - Again, for colder air coming into the turbo, requires lots of plumbing and a smaller battery in the Polo - the part you would want is a BMC CDA
Air Filter - The filter in the airbox in your engine bay, higher the flow, the more air gets to the turbo.
Downpipe - Allows higher flow from the turbo out the back of the car, the first half of the exhaust. APR make one, or get a custom one. Slight increase in power, the first half is the most restrictive in a Polo
Catback exhaust - The 2nd half of the exhaust, not really necessary by itself in a Polo since the back half is pretty good.
Full exhaust - All the way from the turbo back, more gains than the 2 above (cos it is both), but obviously more expensive. APR makes this, so do a few others (or a custom one again).
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