Hi Michael,
welcome to the forum.
Can't really help you on the suspension front but am curious about the appearance of your car. You say it's an M Roadster yet it has the standard 2.8l front spoiler and non-M gills on the side
The rearview mirror is also the standard 2,8l one.
were they changed out of a matter of taste? Or possiblily as a means of understatement?
Or have you had an M-engine fitted to a 2,8l or ..... dare I ask.... is it possibily a 2,8l
Cliff