HKS is expensive stuff. I don't know of many people out there with it on their car. Doesn't JUN make an axle back for Civic's? If so, custom mount that on your car with some custom piping, it might just end up being the same price (it is for a Spoon muffler at least). You'll be even more unique than if you had the Hiper. Another alternative is Apexi N1.

-Andrew