for sale: Zeal Function X coilovers. I bought my 06 sti 4 years ago and it had these coilovers on them. I put 20,000 miles on them in those 4 years, and I replaced them with stock suspension since my sti is now my daliy.
I have not had any issues with these coilovers, and they do not make any unusual sounds. They also have 30 way dampening. I dont know if they would need rebuilt or overhauled. I do know you can send them to the endless factory, and to overhaul, revalve and get new springs on them it costs about $1,200 with shipping, which isnt too bad considering they are $3,000-$3,5000 new. I only know this because i was looking in to putting less stiff springs on them since i drive my car daily now. I would be willing to sell them for $800 obo, or possibly trade for wheels and tires. I would be willing to ship. Any questions feel free to pm me. I also have pictures that I can email or text to you.