Without your location in your avatar, I don't know if these would be acceptable to you. They would work fine for me. I had to do this on my last truck.
2019-2021 Ram 1500 Headers JBA Street legal Headers improves horse power and torque Get it today at FMS. Financing is a Snap. We Install
fmsperformance.com
1-5/8" x 1-3/4" 304 Stainless Steel Torque Series Headers. 2019-2020 RAM 1500 Truck 5.7L HEMI. 3/8" Thick 304 Stainless Steel Flange with D-Shaped Port Headers are one of the top performance parts added to vehicles. Kooks Headers improves your vehicles exhaust performance instantly.
kooksheaders.com
19-22 Ram 5.7L Hemi 1500 Shorty Headers by AFE Power 48-32023. Dyno testing produced +37HP and +58FT-LBS of torque. Gain even more power when combined with AFE Y-Pipe (also sold here).
fasthemis.com
There'll be more info here.
https://5thgenrams.com/community/threads/shorty-headers-for-21-ram-1500-5-7.27811/
CARB acceptance for this type of product is a legal, not an engineering, purchased rating. The actual tailpipe emissions will not change, even if you did a complete hand fabricated exhaust and used universal cats of the same type and location. Same with a CAI; just a purchased rating, doesn't change the actual emissions. For these types of replacement products, CARB is an extortion racket. I understand if you must comply in your jurisdiction though.
I'm not worried about the slight amount that would get out of that crack, since I mow my lawn...