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I don't know about an app, but you can go into settings>system>power>processor to change your processor speed. If you set it to power save, your processor will run at 200 Mhz.
I may be wrong, but unless you set your processor to normal, it doesn't always run at 400 Mhz, anyway. I use the auto setting and whenever I have checked it, it is usually at 200 Mhz.
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