Is it Hypermax 2 or 3? 3 is the newest model and cost heaps more. I used to have hypermax 2 and there's no need to pump air into them.
Can't remember the spring rates for them, but i don't suppose they will be hard as they are supposed to be drag coilovers.
I've got Tein Monoflexs for sale and i think they are much better than the hypermax .