It really bothers me when a guy claims to have xxx amount of horsepower but has no way to prove it.
Show me the dyno sheet.
I'm not a computer guy but, I don't believe someone sitting at a computer can give an exact horsepower number on a guys engine. There's too many variables to account for.
Take it to a dyno and take the paperwork home. Thats the only way to prove your claim of xxx horsepower.
If a guy estimates his horsepower thats another thing. I take estimates with a grain of salt.