hey i bought a set of dual vavle springs off craigslist and i cant figure out which side is intake and which is exhaust. one has blue markings one has yellow. another thing one is shorter and the diameter of the coil on the spring is thicker. i bought it as a set wit retainers and they look like skunk 2 i called them and they weren't any help. by the way this is for a b16

 

what brand are the springs ?