How do you get to the air filter on a slk 350 2005?

This is an easy job and you only need one tool and will take around 10 minutes. Pop the bonnet and remove the big plastic cover on top of the engine. The bottom section just pulls off with your hands, the top section (the bit that has V6 on it) has a clip at the top (nearest the windscreen) then pulls off. It will be attached to 3 hoses which should slide off with a bit of riggling. This top section is actually the air filter housing. Face it down on some carpet and you will notice the two air filters under 8 star screws. The pair of filters will cost around £30 from a merc dealer. Put back together in reverse making sure all 3 pipes are connected.