FYI IXRB was 18x8 ET50, 18x9 ET52 "Sport Classic II"
Part numbers
993 362 134 55
993 362 138 50
You could also go for the moon with IXRC (8"front/10"rears)
Since CS 986S has been discussed elsewhere, here's from someone who ran one in AS back in the day:
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I don't have the details at my fingertips because it was a decade ago, but back in the day a bunch of us spent months trying to determine if the 8"/10" wheel combination was legal, and ultimately concluded that it definitely wasn't.
The owner's manual has no bearing on the legality of a part -- a part needs to have been demonstrably orderable, and we could not find proof for the wider wheels.
One thing that's changed since this was last seriously investigated is that Exclusive options are now explicitly legal. Likely your best bet if you want to claim your parts are legal is find proof that you could have ordered a car that way through the Porsche Exclusive program.
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So just as an FYI, these cars were run nationally in the past, and people know very well that IXRB/IXRC wasn't legal back then when everyone wanted 8" fronts. Note that the rules are slightly different now, if the car could come
from factory in the US with the 8/9 or 8/10 combo you're good to go. If they're
only in the Tequipment catalog, they're an accessory, and they're no bueno.
What you'd need to successfully defend a protest is a build sheet / window sticker from your model year of Boxster S that explicitly lists that a similar car came from the factory with IXRB/IXRC wheels on it. NOT dealer installed accessory.
More relevant post from an actual SEB member:
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Now, as to the example of Boxster wheels... If I were going to try and run wider wheels on my Boxster, I for God DAMNED sure would be bringing lots and lots of documentation that proves beyond a shadow of a doubt that the car could have been ordered and delivered through the US dealer system that way. I'd also be ready to explain why all of a sudden I could produce that documentation when 10 or so years ago folks that were actively campaigning the cars at a national level were unable to do so, despite being very very motivated to find a legal way to run wider wheels. That's not to say its impossible... Its not. But I would want iron-clad documentation.
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For funsies, here's a Boxster on IXRC wheels, which unfortunately proves nothing.
