Green air filters / induction kits - Audi A2 Owners' Club
There are numerous free tools on the internet for you to calculate the required air-flow at specific rpm of your engine. Using that figure, you can find a filter material with the air-box's surface area, then calculate if the filter is giving enough flow. Most custom filter systems I know of that actually works are for high rpm when the std filter is perhaps restricting. With a low reving diesel, you shouldn't find air filter a restricting factor, nor should the A2 petrol engines, we're not talking 7000rpm+ here! having read thru many of the current threads regarding variuos performance improvements (exhausts, air filters etc) it appears to me the law of diminishing returns (expenditure v performance gains) is reached sooner on the '75' than the '90'. Beyond a re-map and de-cat it seems there is very little to be gained irrespective of the amount spent. Even the de-cat does not seem do much for engine output as such, it appears from what has been written it mainly improves 'drivability'. Is this a fair summary? I have a re-map and K&N on my 75 and may go down the de-cat route when funds/income allows and am interested in other members experience/observations.
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