I’m purchasing A 2.3 foot, 2 year old Boa Imperator thats 195 grams on Sunday. I was aiming to get a female of smaller genetics, but I found this guy. He’s quite tiny and light so I’m wondering how big he’s likely to be at around 4 years? I do hope he won’t be anything under 5 foot, since I was hoping to get a 6 foot snake. Girth honestly matters more to me than length, but I do know males are quite slim. His father is 5 foot and mother is 5.6 foot, does anyone have any idea as to how big he will grow to? Unfortunately it won’t let me add an image of him
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To my knowledge (which is minimal), boas are slow growers and this is much healthier for them. It’s entirely possible he may get to six feet in time, but I would not count on him growing 3.5+ft in the next two years, at least not if you’re feeding him on a healthy schedule. I have a longicauda which is a smaller species in general, not an imperator, but he’s 3.5 years old and just now approaching 3.5ft.
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Growth speed depends a lot on how they’re fed. In other words, it’s possible that this boa could still end up getting fairly large, and has just been fed conservatively up to this point. Are you in contact with the breeder who produced this boa? If so, I’d ask about the size and age of the parents and size of the overall family lines. If the breeder has any idea of locality lineage, that would also be helpful in giving you an idea of potential adult size. Many/most BIs sold as pets are a mix of localities, and that lineage often isn’t tracked, so don’t be surprised if the breeder has no idea about it, but it might still be worth asking.
Edit: apparently my reading comprehension sucks, you already listed the size of the parents. 
This boy may get to 6’ with time, but from the sounds of it, he will probably not be a huge boa.
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Alright!! Honestly I’d be happy with 5.5 feet, I had just seen someone say 4.5 feet so I was concerned. Also, I didn’t say this in my original post, but his father had a very small amount of Nicaraguan, not sure if that would even affect his growth due to such a small amount though.
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It’s just hard to estimate exactly how big any given snake will get. There’s also the fact that snakes never completely stop growing, so while his parents are obviously sexually mature at those sizes, they’ll still continue to slowly put on more size with time.
If I were to guess, I’d say it’s unlikely that he’ll hit 6’ by the time he’s 4. But he may hit that size at some point. Or he may not. 
I have a female BI of Columbian origin (more or less) who is around 4yo, and she’s probably about 5.5’ right now (don’t have a current weight). I’ve been feeding her pretty conservatively. I think she was around 6 months old and under 2’ when I got her.
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