Hi All. I'm looking to unleash some extra power, breathability and noise from my 4200 by ding some exhaust mods. I've read a lot of threads on this going back to 2014 and plan to do a primary cat delete and then replace the secondaries with a 200 cell sport cats and add an X or H pipe. One question I have is has anyone kept the original front section with the flattened pipe gutted the primary cats then fitted 200 cell sports cats in place of the factory secondaries and if so what were the results in breathability and noise? Thanks