I was wondering if it would be possible to fit a tire with an overall diameter of 26 or even 27 inches under a 91 integra without rubbing on steering components or metal fender parts (plastic ones can be removed/altered). the suspension is all factory stock, i.e. stock ride height, etc

Tallest tire we've test fit for your car is a 23.6" tires so not possible to run 26 or 27 without extensive mods.