Spoke with 42DD- a 180Q DP is available (street version w/hi-flow cat is $575+$25 s/h).
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No, a smog inspection certification is required.<ul><li><a href="http://www.dmv.ca.gov/vr/smogfaq.htm">Linky</a></li></ul>
The also told me that they have considered using a higher-efficiency cat on the downpipe, but are not offering anything right now.
I live in a smog-test-required CA county and I am going to hold off installing my 42DD downpipe until I am certain I will pass smog, given the destructive nature of stock DP removal.




