I bought a set of the
Bimmer World and
Turner Motorsport reinforcement plates for the E82.
Here's a side by side comparison:
I would hazard a guess and say the Turner Motorsport plates have roughly 50% more surface area than the Bimmer World plates. That's a pure SWAG...
I emailed Turner Motorsport and asked if their plates really had to be welded in, or could they be simply held in place when the struts are bolted up into the towers. Their response was:
"They won’t offer as much reinforcement, but these can be bolted in. I would recommend painting the reinforcement prior to doing that."
Karl.