What air filter?

Ok, so if I get one of these to replace standard air box what else do I need to go with it? Bigger pipe heat sheild?
 
If it's going on to a S3 it will go straight on to the MAF, if it's on a A3 then you'll need a silicone reducer, something around the 70-80mm mark to go between the MAF and cone. don't need a heat shield, when the air goes through the turbo it will be up to super high temperatures anyways so a heat-shield will make no difference
 

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