Can i downgrade iphone 4 to ios 6?

So i have an iphone 4 that has ios 7.0.4 i want to downgrade it to ios 6.1.3/2 because its so slow
i'm not sure about shsh blobs but it was jailbroken when it had 6.1.2 and i heard that cydia saves shsh blobs automatically
so is there a way to downgrade and tell me how (i'm a noob. )

I'm not trying to be mean. But I suggest you not to downgrade. Here are the reason why?

1) In the future most apps will only work if you run ios7.So there's no point upgrading now since right now some apps need ios 7 to work.

2) Too much hassle. Too muck work. In reality you can't downgrade to ios 6. Even if you try different ways it may damage your device. I rather stay with IOS 7 than risk my device.