Quote:
Originally Posted by J!m 
Also interesting that other than the M Roadster, the rear sub frame is wider on ALL Z3 cars (and I have to then assume all M Coupes as well).
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Not exactly... The sub frames on all the ti's, Z3, and MZ3's are exactly the same width. The MZ3 sub frame has a different part number because it has the brackets for the dual exhaust hangars.
The sub frames (and trailing arms) on all MZ3 models are identical, coupe and roadster makes no difference.
The difference in the rear track width comes from the trailing arms... not the sub frame. The best way to demonstrate this visually is to look at the width of the 'hat' portion of the rear rotor. On the M Coupe/Roadster is is not wide at all... think 1-1.5 inches... on the rest of the Z3 line the width is more like the rear rotors on a ti... 4 inches or so. This is why the M Coupe/Roadster rear wheels stick out too far on anything else but an M Coupe/Roadster.
Because of the M Coupe/Roadsters thin rotor 'hats' (and resulting narrower width between left and right) the MZ3 trailing arms are perfect for fit on a ti without having to use a wheel with a giant offset like the M Coupe M Roadster does.
Hope this helps.