The biggest difference between ARH and JBA is that ARH offers their headers in a 1 3/4" option where JBA only offers them in a 1 7/8". The larger 1 7/8" primary will make more top end power, but less tq down low. To offset the tq loss down low, you will want to step up to 4.10 gears and a higher stall tq converter as well. Without the gears and converter, the truck will likely feel slower around town with the JBA's.
With the ARH headers being available in a 1 3/4" primary, they will make more tq in the lower and mid rpms which will benefit your everyday driving. Gears and a higher stall converter will still benefit you with the 1 3/4" headers, but are not as necessary because you wont lose tq down low like you will with the JBA's.
As for inspections, you will need a custom tune regardless of which header you go with. A custom tuner can turn off the rear o2 sensor codes that you will get from either setup. I don't run cats on my trucks, and I still pass the inspection because of my Hemifever tune. If the shop wants to get picky, they can fail you for the visual inspection by not having cats, but most wont take the time to look if the computer reads clear.
