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Two potential advantages to going square:
Reduced understeer
Ability to rotate tires (even tire wear)
Issues usually revolve around having enough room to run this type of setup. The Z4M has the E36 front-end, so IIRC other threads on this you can't get anything like a 265 width to fit-255 probably does with some tire/wheel combos, but ability to set camber is somewhat limited then due to space IIRC.
If tire wear is an issue, then I think agree with The Hack (other thread) where he states that you don't really save as net wear is pretty much the same--the difference is you replace 4 tires less often rather than replacing 2 more often.
Understeer can pretty much be managed with camber settings, and I'd rather go that route personally as it facilitates more even tire wear (assuming you track or auto-x a bit, or like to canyon carve).
I seem to recall some folks saying the car did not handle well square and it really wasn't designed to run in that config.
Eccentric--what requirements are you trying to fulfill with a square set-up?
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