[SCOTI]

1" narrowed arms help tucking the wheels on aggressively lowered trucks.

1" forward arms are not needed but they help re-center the front wheels in the opening when trucks are aggressively lowered (more than 5" inch front drop). 1" forward lower arms like PB offers & standard upper arms would increase caster which is an improvement for these trucks as the factory set-up is very limited.

If you already have POL arms for bags, why not just purchase the PB coil spring adapters for the arms you have? If the adapters are meant to bolt into an arm designed for bags, it shouldn't take much to make them work.

An air suspension can be made to work in an Autocross application. It will take extra $$ vs. a factory coil type set-up.