Any particular reason the TyrolSport Deadset locking collar kit is worth 100% more than ECS version? I realize the ECS kit is aluminum collara and OEM bolts compared to brass collars and ARP bolts for TyrolSPort...but $112 vs $225?
Different materials. Are you building a race car or is this your daily? That would drive my decision. I wouldn't hesitate to use the ECS kit, but I'm not running collars either.
It's a pita to get everything squared up since the kit is designed to get rid of the slop on the subframe, but it's doable.