I was going to ask "how much caster do you need"? Bacially enough for the car to drive down the road with no hands on the wheel. May be more for a drag car or one for the salt flats.
Factory settings were "0" to minus "1", ( think front wheel of shopping buggy flopping around) - so any pos caster is going to give better directional stability
I just don't get this wheel "slamming" back to center .
On a long race/drive, no power, that's fatiguing
Coast road without power steering, caster +6. lol.
I understand and use big caster for autocross, road course, ya know, racing, - but for street, absurd . jmo