My exhaust set up.
 

I need a cat and no cel to pass inspection so im going with a catted uel header from ft86speedfactory. Then i can put on a cat delete front pipe and overpipe! Out back i am going with the invidia n1. I hope its loud! The car is not my daily so i want it loud. Any suggested changes tho regarding my header or cat back?

What's your location? If you're in the US and you have a visual inspection as well, it's illegal to remove OEM cats at all. If it's just a tailpipe sniff test, a single cat can pass that. If it's an OBD2 test, a tune will pass that by disabling that CEL.

If you don't want to get a tune, get a catted header. FT-86SF, P&L, and JDL all make them. You'll be losing out on available power without a tune though. Personally, I would do an uncatted header and a high flow cat in the front pipe, then flash a stage 2 tune. An uncatted header with the Invidia N1 will be loud.

It's my understanding that emissions testing looks at OBD2 readiness checks, not CELs, and a tune can not defeat this.

Yea im from PA so i have a visual test as well as i plug in test. I was told that a single cat on my car should be passed. A tune is a must to get good NA power so i will do that in the near future. So a catless header and a high flow catted front pipe is my best bet?

With a Tune you can turn off specific Cel codes forever.

Wait, phrosty your telling me i should run a catted header?

That good news :)

Also, what header has the most boxerish uel sound? If that makes any sense. Lol

Its all the same

My point is that CEL code and readiness test are two separate things. You can turn off a CEL, you can't turn off readiness tests. OBD2 emissions testing checks readiness, not just CEL. A tune will not help you pass emissions.

I believe the Borla header has one of the more aggressive rumble sounds to it. The FT86Speedfactory catted UEL header (which I have) actually has a nice boxer rumble down low in the RPMs and smooths out at higher RPMS and has a more EL header sound to it.

Does anyone have experience with the cel fix with the borla uel header ?

There's no fix for a specific header. If you have a catless header, or even remove the cat from your stock header, a tune can disable the code (P0420).

I have a catless Tsudo UEL header and I had the CEL from it. I flashed a OFT tune and no more CEL.

@phrosty I don't think a tune does anything to affect OBD2 readiness, it just disables whichever codes you tell it to.

More of a "fix". Its not guaranteed to work but its worth a try i think. I was hoping someone else would have some experience with it. Then i should pass inspection with just a high flow catted front pipe :)