2 inch pipe vs 2 1/4 inch pipe

ya i guess i can put that 300 bucks in the engine or drive train, with 375 bucks i can get a bad A$$ built valve body for my transmission from crt. I'm not a whole lot worried just saying i always run 2 1/4 inch pipe on all my small block mopar's and 2 1/2 on big blocks, i have no expierence with running 2 inch exhaust pipe on anything from what i have read it works good for small blocks and on trucks for the torque nd some people say its too small but since its already on there and brand new i wont worry about it, unless i come into some money and can easily afford to get it changed to 2 1/4.