Header Selection Help!

[L0tusExigeS]

I was hoping to gather some feedback on header options. Main goal is a bit of power gain and to bump up the exhaust sound a bit more than just with the 3rd cat delete and Miltek controller. I see three options:
1) Catless headers and 3rd cat delete (fully catless system)
2) High-flow 200 cell headers, 3rd cat delete
3) Catless headers, 200 cell 3rd cat

I suspect a CEL is unavoidable with option 1, but would like to hear if anyone has tracked this option without major issues?

My main question is could option 2 or 3 avoid a CEL w/ O2 spacers and still be a noticeable bump in exhaust tone?

The final question would be, which design is best, from below?

Phoenyx Catless or 200 cell headers:
$1499 catless, $2499 200 cell
https://phoenyxdesign.com/products/lotus-emira-3-5l-phoenyx-design-race-headers?variant=50295786242337&country=US¤cy=USD&utm_medium=product_sync&utm_source=google&utm_content=sag_organic&utm_campaign=sag_organic&gad_source=1&gad_campaignid=20908913258&gclid=Cj0KCQjwovPGBhDxARIsAFhgkwSKV2DhHp7jwcxyK_csmvGF3gatT1abqzKl_hMxX8r7gTxEibBETX0aAjDtEALw_wcB

GRP Catless headers:
$1299
https://www.gregsraceparts.com/products/grp-stainless-shorty-race-headers-for-evora-emira
O2 sensor at collection

Jubu catless headers:
$2800

JUBU Performance -

Tuning und Porsche/Lotus Service in Österreich, Inspektion und Unfallreparatur für Lotus und Porsche. Vertrieb von Porsche und Lotus Performance Parts.

www.jubu-performance.com

O2 sensor position tbd

Komotec catless headers:

Manifold 3:1 stainless steel Emira | 2201-001b

Motorsport Manifold for Emira To help the Emira V6 something on the jumps, we offer a manifold system. This has been developed and tested on our dyno, so we have achieved very good results. The manifold is made of stainless steel and the pipe lengths ind…

www.komo-tec.com

$2100
O2 sensor position tbd

Premium Heat Insulation Motorsports Header By Aerie Performance

“The header is currently in good stock and available for same-day dispatch.“ Introducing the Aerie Performance Premium Heat Insulation Motorsports V3 Headers, which are designed to take your racing experience to the next level. Our latest version features a unique manufacturing process that...

aerieperformance.com

$1100
Updated O2 sensor position at collection

Third Cat: Jubu HJS HD sport Catalytic converter
991.86 Euro

 

[Eagle7]

Based on the design, I'd say the @GRP or @Aerie would be the best, but those would require you still keep the factory 3rd cat and that setup would likely be LOUD. With only one cat, there wouldn't be enough emissions control to pass any standards either. The headers with cats on them are so short, why bother? The whole point of headers is to open up the flow path out of the exhaust chambers of the cylinder head, to improve scavenging the exhaust out of them. A good design is a combination of length and bend of the pipes, and how they come together in the collector. Air doesn't like to turn corners, it loses velocity quickly so the smoother the bends and angles, the better. GRP and Aerie are the best looking in that regard.

If you're going to get the headers, get the y-pipes too. Both GRP and Aerie's are decent looking as far as design and build, but then you have the issue of only one cat. For a track build... yeah. For the street? It's going to be loud, and you won't pass emissions... where do you live? Different states are going to be more or less sensitive about this sort of thing. There's also the possible issue of the ECU not liking the change. You might need a tune like the JB4.