The Trofeo version of the 4200 used a K&N cone style filter. I mimicked that setup but used their oil free filter, as I’d read that was better for the MAF sensor.Hi guys, I'm sure this has been beaten to death before my time on this forum but please bear with me: what is the consensus on this forum about using an oiled air filter versus the factory paper filter on our cars? some years ago I've read on the Audi forum I was part of that micro oil particles from such filters tend to cling to the thin wire in the MAF sensor and render it unreliable. Solution was to rub the wire with alcohol and hope you won't break it. I've read a post about cleaning the MAF sensor on the Maserati and it seems to be different from the wire on the Audi. But first things first, does it indeed make a difference from what you have experienced?
Pretty sure I have a post on here somewhere covering the parts but the key part to know is the K&N part number is RU-3105HBK
Here’s the Trofeo intake drawing copied from Eurospares
2004 CC “Siluro” the Italian Torpedo
2011 Audi A4 “mafia mobile”