3.0i headers

[terminx]

Originally Posted by Ricky Bobby

^If I didn't have emissions testing I'd definitely fit them, but by the time I get cats welded in (they'd have to be small) and everything else I hate staring at CEL's - I haven't read from anyone who fitted cats onto these headers and were CEL free

You just need to get the right aftermarket cats for the application, and weld in O2 bungs after the cats for your post-cat O2 sensors. Alternatively you can leave the post-cat O2 sensors physically before your aftermarket cats in the exhaust flow, but add spacers so that they're further from the exhaust stream and thus see lower values. It's definitely possible to do headers without a CEL.