i am sure the original speakers were never premium units when new, and if original from 2011 may be not at their best, so any replacement may well result in a better sound and suit a std head unit , all 4 would not be a bad idea too.
They will improve sound,but hardly noticeable. You need to fit an amplifier to hear real gains.
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I noticed a difference when on the stock unit. Only issue is the stock unit didn't offer much in relation to a eq meaning you couldn't fully take advantage of the speakers.
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