I replaced the stock servo saver with the turtle racing billet one,,,, got rid of stock tie rods and use IRP tie rods with there 5b/5t standoff kit to improve articulation,, pretty much bullet proof and no slop,, also use rpm arms, with team fast eddy hub cone combo,, IRP's upper arm rod ends,, and replaced the stock front hub and steering arms to hpi,, also using hpi front hubs,, inner and outer bearing sit slightly closer together than on the stock km,,, my uber rc hubs wouldn't bolt on properly until I changed to hpi,, now u tightened the bolt till tight,,front wheels spin like a dream,, couldn't do that with km hubs,, had to leave bolt loose or bearings got to tight,,,,