WOW, I know nothing about it either but that seems higher then I expected
Where's the money?
most complete kits cost about $1000 to $1500 ( more functions more cost, f,b,s2s,pancake, 3 wheel) add the plumbing, battery(s),modification time ( frame, a-arms, mounting the compressor, running switches, etc.)
plus if you start adding personal custom touches then the price starts to rise.......
there are quality set ups and cheap set ups but just like every thing else you sometimes are just buying the name attached to the product so due the research dont go with what everyone else is using....... ie ( i got cheap wire wheels but if it makes you feel better i'll tell you their dayton's.)
and if you know the right people........ S.S........... lol...... then yeah it is cheaper....