My 90 CRX-si is rather bumpy driving over any road irregularities. What would be the best suspension replacment/or upgrade for it? 270,000 miles some maintenance but anything could be worn.

 

Depends what you want-lower, different tires/wheels etc.

I did Bilstein HDs and OEM springs on mine-love it. Good with 15" wheels, even better with 13" wheels. I know, my ass is getting old though.

This was after trying KYB GR-2's and H&R OEM sports, just too low and harsh for my taste. Plus a PITA when it snows a lot-and that's not even low.

 

I did Tokico Blues and OEM springs. Also, replaced rear trailing arm bushings (both sides were toast) and did a four-wheel alignment. (before doing the alignment look at the ball joints and tie rod ends)