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Hello,

I have a 97 boxster which I would want to upgrade the rotors to a bigger one. I heard from a friend that changing to bigger cross-drilled slottted rotors is possible and a set would come with a kit/adapter that would adjust the calipers to accomodate the bigger rotors. I dont want to change the calipers, just the rotors and make it bigger for show.

Does anyone know where I could get this online?

Thank you guys!

Edited by gunman168

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To fit the larger cross-drilled “S” rotors, you will need different calipers as well as the rotors, as the rotors are both larger in diameter, but are also thicker as well. The base calipers will not work. Fitting the “S” rotors to the rear is even more problematic as you would need to swap out the suspension carrier hubs as well as the rotors and calipers, which is both time consuming and expensive.

As for some “online kit” that uses an adaptor under the caliper to space it outward for a larger diameter rotor, well that sounds like a death wish waiting to happen……

Edited by JFP in PA

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Find a set of the "Big Red" Brembo's with rotors for the front off an "S" on eBay or Craig's and change them out. The fronts are the most important and you can always repaint the rear calipers and change the rotors to drilled and slotted so they match visually. If you have 16" wheels on your '97 they will not work you need 17" or larger for them to fit. As JFP says changing out the rears is expensive as not only do you need to change out the carrier hubs but you need the emergency brake mechanism changed to the newer one as well. The other issue you will run into is the axles on your '97 are not as large a diameter as the "S" axles (the spline fits) and will not register on the ABS sensor that reads axle rotation and your ABS and airbag/ seatbelt lights will come on on the dash, so a reworked bracket that holds the sensor further down it's shaft has to be manufactured so it can read the rotation or you have to change out your axles. The rear can get very expensive to deal with on the pre "S" cars. I lucked out and found an auto dismantler who is also a Porsche mechanic and knew what he was doing and basically removed the rear suspension from a 2001 "S" and swapped it out on my '99 and the change from the OEM Brembo's to the Big Reds on the "S's" has been dramatic.

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