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Some high-dollar cars do have variable exhaust manifolds as well. Or at least exhausts that are changed on the fly. I can think of at least one Porsche and at least one Ferrari that were set up that way. Oh, and a few more street cars that have an "extra noise" button you push to change the exhaust note.
That's not to mention thousands of ricers with "dump pipes" or "cutouts" that make tons of noise and no extra power.
Intakes are pretty clean and low-temperature things. In a modern car, they are transporting clean cool air. You can make moving parts that will move freely and seal nicely for a long, long time. Exhausts are a very hot, wet, dirty environment with acids and soot and all kinds of nasty stuff in them. It is tough to make articulating parts that will last a long time moving freely and sealing well.
-soD
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