Only warranty I can give you is that they work, if you buy them and I put them in your car they will work I can guarantee that . As with all elecronic parts you can stuff them up if you dont fit them correct, nobody will warranty that .
The price is $490 , no I wont take $430 , don't forget they are like new , if I didnt tell you they have been used you wouldn't know.
Very short period of time to rectify a fault on a car that turned out to be the CAS. ( not my car)
They are exacly the same as the stockers , so you can put the cover back on. Do you have a series II GTST? If yes they are suitable , If you have different car to your avatar then do a search to see if they are suitable using the part number in the pic. I know they are suitable for a series II GTST and R34 GTR.