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I've got a 958.1 TT. The front calipers are massive lumps. You will lose the ability to easily pop out the pads (switching between track/street). The calipers probably weigh 25-30 lbs, so even if you could get them to fit, you're probably adding unsprung weight. I'd purchased the caliper pins to hold them while changing the pads but ended up using a box instead. You don't have to use a Bulgari box, but I figure if I'm wrenching on a Porsche, I should spoil myself.