Can I install iOS 7 on my jail broken iPhone?

I have an extra jail broken iPhone 4 running version 6.1.

Can I install iOS 7 on it?

I know it will override the jailbreak but can there be any issues?

It will most likely be quite slow with iOS7.

If it were me, I would just tweak it on 6.1 to look like iOS7.

http://www.isthereajailbreak.com/

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