One of the things on my list to do on my Cummins 6.7L after the MBRP exhaust that does away with the muffler is to replace the Catalytic Converter. Eastern not only carries Diesel Converters but they can build you one to your spec. Eastern Catalytic Diesel catalytic converters

__________________

2007.5 Dodge Ram 3500 HD,QC, 6.7L Cummins, 6speed Auto, 4X4, Bighorn Edition.
Click for installs: Carr Steps PML Diff Cover Edge Juice with Attitude Volant Intake Hankook ATM RF10