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Originally Posted by easyc
Thats a difficult question... ideally since you are running .4 more liters, you would want headers bigger than those made for a 3.2 or 2.7... but 996 headers do not fit under a Boxster... so just find the biggest you can.... BUT you want to pass emissions... thats a whole other can of worms which would start with does your state check emissions? or do they rely on the OBC? do you want to run your secondary cats? etc etc... that answer can be searched on here...
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Well you made a very good point about missions. In Austin they only check for codes on OBD II cars. Older ones they do the sniff test. I think that is correct anyway. If so I could forgo the secondary cats and use thoses bypass sensor adaptors too keep the trouble codes away.