My views and experience as posted in another thread
I went for the Dualtechs, reason being as they have rubber top mounts as opposed to pillowballs so are more compliant and comfortable, the damper is twin tune not monotube so there's a layer of protection for the piston inside especially on our roads and conditions, the inboard rear spring setup is like oem works like standard, also the rear shock towers aren't designed to have a full coilover so the load could potentially cause the towers to fail. Much like the E36 and 46 BMWs, used to have a 36 so followed the same procedure
Brilliant coilovers though! 14 way damping adjustable, loads of height adjusting available, spring preload adjustable aswell. Good thing about these are the design when lowered, no matter how low you go you won't bottom out as the travel always stays the same
you will need camber arms if you lower it, I thought I'd get away with it but clearly not you won't need front ones no matter how low you go, but rears are needed with toe bolts. Go for the Eibach ones, I did. They are the most expensive but are the best quality and come with the bolts. All will align back up perfectly when they are on
Toe is done by bolts on the rear which you have to elongate the holes in the chassis. The front is done by the top arms and they have more than enough adjustment to get it back to normal. Sly was saying dont bother with front ones