It's getting to that time when I'll need to replace my tyres. I've got the OEM-spec Continental all round at the moment. My thinking was to get them replaced with Pilot Supersports but Michelin also recommend the Pilot Sport 4 for the Z4M. Having done a little bit of reading, it seems that rather than a replacement for the Pilot Sport 3, it is in fact, a replacement for all PSS sizes that aren't OE. My question is - has anybody fitted PS4 yet and if they have what do they think?