Can I install OS 10.6.8 over OS 10.8.?

I just bought a refub 2011 imac. It came with OS 10.8. What do I need to do to install OS 10.6.8? Install old firmware?
greg

So my refurb 2011 i7 iMac is
screeming fast booting up in OS 10.6.8.
Great to hear you had your problem easily resolved and that Snow Leopard is now screaming on your machine.
It's why I've remainded on 10.6.8 on my Early 2011, because I know it's a slim/fast OS X version.
You can do some more things to keep it fast.
1: Don't let your boot hard drive get over 50% filled.
Why is my computer slow?
2: Max the RAM.
Install/upgrade RAM or storage drive in Mac's
3: Use Firefox and employ these tweaks.
For Snow Leopard Speed Freaks
4: Create bootable clones so you restore your 10.6.8 quickly with your 10.6 software intact, thus not forced to upgrade to a later OS X version to reinstall their software.
Most commonly used backup methods
Snow Leopard still has over 25% OS X version market share, so it's going to get updates for quite some time yet.
OS X 10.4/10.5 need to upgrade, 10.6.8 ok still

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