I reckon it's purely for looks. It's not the 70's anymore where manufacturers can get away with running the same basic bodyshape for 10 years and still be a top seller. More manufacturers, more models, and people are more picky. If there are half a dozen different brands with a similar car with similar features at a similar price then a tiny little thing like a twin exhaust making a car look a bit beefier than it is may be enough to sway a buyer towards that model.
Same on the V8's. They used to have twin exhaust, now it's about twin exhaust with quad tips. Everyone wants to be bigger and better than the other guy. Makes you wonder when things will slow down a bit. Remember when the 215 KW commodore was the ducks guts? Whats this new Falcon hitting, nearly 400?
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