I had cheap ebay headers on my Boxster for 7 years without a problem including many track events. Big word of caution though, the exhaust manifold bolts on Boxster's tend to snap off in the head which can be a HUGE problem. I had to tow my car to a machine shop after every bolt extraction method out there failed.
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1997 Boxster 4.2L Audi V8 Bi-Turbo
2003 911 C2
NASA HPDE Instructor
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