I bought a Pierburg sensor for £60 a few years back for my CLK. Just a straightforward 5 minute changeout and a fraction of the price. Worked a treat,, never had ANY problems. If my MAF sensor goes on my X I'll be buying from Pierburg again.
For the 'star' type screw I just used a standard
tamperproof torx bit. Sorry, can't remember what size. However I do remember it not fitting that well, so I just carefully used pliers on the head of the screw. Its only screwed into the plastic so not tight-taking it out or putting it back in
__________________
Present:
01 X5 4.4i
07 Yam R1
Past:
89 R32 Skyline various mods, running 442 BHP
00 Merc CLK55 AMG
01 E39 M5 Haywood and Scott silencers
02 E46 M3 Supersprint Cats, Eibach Lowered, Thorney Motorsport Remap, running 368 BHP