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Not a bolt-on task. I have fitted both 993 and 930 rotors to a '86 with great results. You will have to fill in the existing mounting holes on the calipers with aluminum and re-drill to fit the mounting ears on the hub. You will also have to make up good thick spacers to go in between the rotor and ears to centre the caliper on the rotor. These will also have to be seated (machined) into the back of the calipers. Using small diameter rotors may also present problems with fitment brake pad sweep. You will need a larger master cylinder such as the ones used on the 930 otherwise you run the risk of loosing your brake pedal in spirited driving or on the track. The flex brake lines will likely have to be replaced with longer flex stainless steel. I doubt that 15 inch Fuchs will work. I have 16 inch Fuchs that are quite tight and need 6mm spacers and longer wheel studs for the front as the calipers hit the spokes. And, finally, you may need to roll the lips on the inside of the front fenders to accommodate the extra 6mm, depending on the ride hight desired. Otherwise you will have to set your camber more aggressively which will chew up the front tires earlier.

Pics of 993 rear caliper (May be same as C2, check PET) on my '86 with 930 rotor and 930 front caliper with slotted rotor fitted later on same car....

post-80157-0-42521500-1381229785.jpg

post-80157-0-54937800-1381229827.jpg

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Thanks for the info.. A lot of work. Not sure if I want to go through all that. May consider using 930 calipers and just modifying the rears to work. I'll post what I'll do. Again thanks for all the info.

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