Have question for Magnaflow owners

[66farmer]

I ordered a pair of Magnaflow 3"x22" oval for my 66 short stepside I'm running a 454 3" pipe will exit rear of the tires not plaining on installing a H or X crossover. Well yesterday the brown truck dropped them off. I got them out of the box and the first thought I had is that is a big ass muffler. I ordered the 22 because I don't want the truck to be real loud but I think know I went to big. Could you guys that have the Magnaflows tell me what you think of them and what size your using.

Thanks for the help