Header upgrade

[Altima4AT]

I am looking into a header/down pipe combo from stillen and was wondering if anyone knows if it is an easy install? Also if it will pass smog afterwards?

[LeGeND42o]

If you are going to pick up headers from Stillen, you will NOT pass the emission test. The headers from Stillen come with a downpipe eliminating the CAT which is what you need for emissions testing. If you can find headers from OBX, i think you will have alot less problems. And the install is recommended for professionals, its about a 5 hour install i guess (thats what the mechanic said). If you do purchase headers from Stillen, make sure you switch over to your stock setup.

[Altima4AT]

are obx headers just as good? and where can i find some ive looked but cant find them