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Old 01-04-2013, 09:44 PM   #254
kook
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Join Date: Jan 2013
Location: Perth, Australia
Posts: 155
My Ride: F20 125i
I've done a lot of reading on this, and a lot of the subframe cracks can actually stem from the OEM subframe bushings themselves. The OEM bushings have raised lips which contact the subframe metal when put under load. So only a very small area is contacting the car, and those small contact points happen to be right on top of some fairly significant weld points.
AKG/Powerflex bushings have no raised lips, they're flat, so they spread the load evenly over the whole area.
Here's a thread on M3Forum, started by Obioban who seems to be one very knowledgable M3 guy imo.

http://www.m3forum.net/m3forum/showthread.php?t=411517

It also has the link to the Redish Motorsport install vids. I suggest anyone who has any interest in the subframe issues at all watch all 3 vids, lots of good info in there.

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