Pics of my C4 Sport Design 11.5" wheels on Boxster!

[Nine8Six]

Originally Posted by ryanjboutin

Are these Boxsters really so fragile that 1.5" wheel spacers will make parts fail?

I've ever had a problem with wheel spacers 1.5" wide on my trucks.

Both ways (big & small wheels), parts of those assemblies will eventually fail. Nothing last forever. However the more mass (and others) that you introduce, faster that failure will occur - normally. Goes a long way... greater axial force, new harmonics, can go on forever like this. Obviously never solved nor tested by Porsche (or anyone?) so all based on luck here.

You need a black paint job if you plan on keeping those wheels on for a while, OP

[78F350]

Maybe keep the wheels and cut down a bit in spacer.
My '01 came with 20x11 wheels. It's a tight fit. It does rub the fender on the sidewall occasionally. I'm guessing that yours rubs fender on the tire tread. Not a configuration I'd take to the track or autocross, but it's nice to see something different from time to time.