I used to clean mine evey 6 months as it used to get filthy. Used to find leaves, dirt and other objext in there. Only got a pnael filter on the 4mo which i cleaned last month,
Nothing like a feature wall at all buddy. Have you got these fitted to yours? They are exactly the same for both cars. Was going to ask that exact question as i looked at ordering some recently and they only said r32 and nothing about a 2.8 4motion. Did you go for competion mounts or fast road.