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Adult red tails can get between 8-12 feet normally I belive some have been reported bigger these are the females males are smaller even though I have heard of a 10ft male, common boas the females get normally a max of 8ft.

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Live for today Not tomorrow.

You cannot control the size with how you feed or the size of the enclosure (unless you starve the animal) The mainland Boas (red tail boa's peruvians, columbian,,,etc) are larger than the Island boas (hoggs). Expect 6-9 feet for a mainland with the females being larger. You won't be able to predict it's size til it is full grown. My advice ? save for a Hogg if ya want a smaller boa.

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Ken
"Some people spend an entire lifetime wondering if they made a difference in the world. But, the Marines don't have that problem." -- Ronald Reagan

Its not healthy to withhold food or power feed. Boas should be fed weekley, you dont want them to have health problems due to underfeeding, if you dont think youll have the room for atleast an 8 foot boa in 2 years I dont reccomend getting one...my boa grew 10 inches in a month...just a thought..thier average growth rate is about 2-3 ft a year I believe

And you really don't want a boa that is constantly hungry!
Thats just asking for trouble!

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Merlin,
What's Life Without A Little Magic!

on average.. you can expect 6-8ft for males, 7 to 9 for females.. there are always the cases of a little bit bigger or smaller, but not normaly... a 12 ft boa constrictor imperator is a exceptionaly big one