Few people seem to like the 4165/4175 carbs. And that's putting it in a positive light. That said, I have an 800 cfm 4165 and is one of my favorite carbs on a factory spreadbore intake on a stock to slightly warmed up 440.
I dont' know enough yet to say one way or the other but I'll be able to directly compare it to the 4150 model it will be replacing. I'm not sure what makes 4150 DP perform different from a 4165.
