I've been looking into Long Tube headers. But which LT's are emissions compliant? And another question which Y-Pipe can I use?

 

No LT design is emission compliant, and before all the folks with more lenient emission standards (varies from state to state) chime in saying they passed with flying colors, be aware that it is a federal offense to relocate the catalytic converters from their stock location. Is it a stupid law? Yes. Do many people know that or even care? Not many, and as long as it passes the sniffer, it's good to go in most jurisdictions.

 

I used the Jet Hot LT's and their coated (hooker) Y-Pipe, from there any cat-back will fit. I had no fitment problems at all with that setup

 

In the sig, highly recommend