Fender Flares

I don't think that would do a whole lot. Fender flares let you widen the rims not make tham larger. You would have to take out the plastic inner fender well to put on 20's and I don't think anyone has done that. THere is one person with 19's and they fit
 
20s would be to freakin big unless you bling-bling and all, 17s-19s are better through. my 2cnts peace!
 
20's?! whao not even the wings west protege has 20's... be careful if u are using that car for everyday driving - chris
 
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