Bump steer is a "feature" of the Boxster, unfortunately.
If you're cornering over cement slabs, on a freeway overpass or on-ramp for example, as the rear suspension compresses the car will oversteer. I installed one of Pedro's super braces to combat this effect. It's better, but still there.
It's a side effect of the rear end being designed to understeer if you chop the throttle mid corner.
This is one of the things that made me decide to buy a Ferrari. I was pretty sure the it wouldn't do this. Sure enough, it doesn't. I still love my Boxster, but not as much in certain types of corners.
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2003 Boxster S
1995 Ferrari F355 Spider
San Francisco, CA
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