which coilovers are these? (pic inside)
 

Hi guys, mabe you can help me out.

oes anyone know who is the manufacterer of those coilovers? The only manufacturer with this colours iwhich i know is kei office

https://666kb.com/i/bwt1iowym268uhhmw.jpg

thanks in advance

A quick google search leads me to believe you, sir, are correct. Those would be Kei Office.

2 other buddies also said that these must be Kei Office....

Does anyone knows something about the spring rates, adjustability etc.?

I know that Kei Office coilovers are known for there very high spring rates and focus on drift-setups... any input would be nice...

I'm searching for some cheap used coilovers and found them for 500bucks... I think this is a good deal if they are not shot?

These are notorious for wearing out quickly. They're also known to be super hard/firm.
Check to see who can rebuild them. As far as I know there arent many people that are able to do so. You might be able to have bilstein inserts put in them.

I think those are TE type. A friend of mine has Kei Office coilovers on his S13 and they are mega stiff. The one looks like the seals are a little leaky so it is going to need rebuilt. But he talked to a local hydraulic shop and they said they can do it. Also, if you are looking for used coilovers around $500 I was just on eBay a few days ago and there was a set of APEXi, Cusco, and HKS all in the $450-$600 range