I needed new king pins so decided to go for the Suplex conversion. Sure, it wasn't cheap but then neither was the hardened king pin replacement. Not only did I feel the improvement driving but SWMBO felt it as a passenger and reckoned it was worth the money.
I never liked the roller throttle pedal and fitted an organ pedal about eight years ago, I love it, one of the best mods I've made.
So my vote is in favour of both of these mods.
