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      01-08-2012, 08:40 PM   #47
bigjae1976
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Drives: 11 E90 M3 Individual
Join Date: Mar 2006
Location: Houston, TX

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2004 BMW M3  [4.50]
2011 BMW E90 M3  [5.25]
2013 BMW 328i  [5.00]
If a caliper is the same for multiple kits, it doesn't mean its exactly the same. I know ST uses different sized pistons depending on the application. So what might look like the same ST40 caliper for 2 application, the piston sizes could be different which might creates some unintended effects. The car will stop and I would imagine be very safe, just won't be optimized.

Not sure if Brembo or other companies tune their piston sizes for each car.
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