A JB1/JB4 unit will give you 80% of the benefits of a full remap (like APR etc) for about 50% of the price of the full remap. And you can remove it if/when you sell the car and recoup at least 50-60% of the purchase price.
If you decide to do a full remap, also consider Underground Performance Underground Performance seeing you are in Melbourne.
A replacement air filter will not void your warranty, but i would suggest looking at AFE filters over K&N as their quality is much better in my opinion. Such as: aFe POWER 31-10254 Magnum FLOW Pro DRY S Air Filter | aFe POWER
A complete replacement intake such as https://www.uspmotorsports.com/Volks...1.8T-2.0T.html could be "blamed" by a VW dealership for causing a number of engine failures if you were unlucky enough to have this happen to you, but the likelyhood of it actually being the culprit of the issue is very very low. Unfortunately this is a risk you must take if you want to modify the car, and most dealerships (regardless of whether its VW, Renault etc) will blame a modification for causing the issue even if its not related.
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