Ditto what bastard said. To add to that, if by 'better' you mean 'more grip', then definitely don't replace just the rears. The ASX , while a high-performance all-season, has nowhere near the dry grip and handling characteristics of a summer performance tire.
If you just want a better quality tire, I'd still be leery, but if you have to go that route, get another high-performance all-season tire.
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