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Originally Posted by Blue-S
The 2000 and newer Boxsters are Low Emissions Vehicle (LEV) certified -- not just in California, but all US-specification Boxsters. Presumably due to their (relatively) low sales volumes, Porsche certified all Boxsters to meet California emissions regs. So, that's why the 2000+ Boxsters have pre-cats in the exhaust manifolds and the main cats in the mid pipe.
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Hmmmm,
so I have two options:
a) replace 2nd ("main") cats with bypass pipes
b) replace pre-cats + headers with "hi-flow" headers w/o cats and relocate O2 sensor behind main cat
In your opinion which scenario has a higher chance to pass smog in CA?
Please note that I already went with option a
