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I was wondering if it was possible to replace the OE RS2 calipers with Porsche 996/Boxter monoblock calipers front and rear or would the 304x32mm RS2 front disc be too wide ?

Since these calipers don't have stainless steel pad guide plates like the RS2 ones they wouldn't suffer from the corrosion issue with the plates lifting & causing pad binding issues, etc.

The best place to try and fathom out the different Porsche callipers is probably here:
http://www.pelicanparts.com/MotorCity/wmv/brakes.htm

The answer is I think so ! In my experience the S2 forum may be able to give you a better answer for this type of question as many more of the owners there have upgraded to porsche brakes.