N.B., Norseman--your 91 is one of the "2nd generation CRXes", which ran from 88-91 in the US. They were all fuel injected (of the 1st gens, only the Si was injected), and had double wishbone suspension at all four corners. The 1st gens used torsion bars and a solid rear axle.
I wouldn't recommend a large rear sway bar on a 2nd-generation CRX. It would make the car far more prone to swapping ends, which isn't so good for fuel economy.
-soD