stupid muffler-less turbo back question
so, I have a theory, and i want some other opinions. Irregardless of brand, a 4" muffler-less turbo back exhaust will flow the same, lower the EGT's the same, and create idealistically the same amount of power and torque, so in theory it doesn't matter if i use a 200.00 exhaust or a 500.00 exhaust because they will all create the same results. now im not talking about differences in materials and such but more of the results they achieve. Am I correct on this? is the only real differences besides materials the fit and finish of the exhausts?