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you can use a bandsaw with a diamond coated bit like the $100 one from harbor frieght but you will have issues with the blade binding due to the hard substrate it is attached to. You can get around this by lubricating the cut with tank water often.
That being said, here's what I'd do:
Go to home depot and get one of those flat, chisel with a spike in the middle shaped drill bits, I think they are for drilling big holes in wood. The spike keeps the blade from skipping and mangling your favia. You just need to put it on the cement of your garage and chisel it with the drill bit and a small sledge or framing hammer. Don't be afraid, I have seen it done with lords and no bad effects, the half heads were even out the same night!
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