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By running pipes from the catalytic converter to the muffler and from the muffler to the exhaust tip, [cat dpf delete pipe 6.7 cummins](https://cnrautoparts.com/2007-2012-cummins-6-7l-dodge-ram-2500-3500-4-cat-dpf-delete-race-pipe.html) back exhaust systems improve exhaust gas flow, providing small performance boosts. However, your performance gains may be limited if your catalytic converter restricts gas flow, as a catback exhaust system is installed ‘downstream’ of the converter. Header-back systems are increasingly rare, namely because of modern emissions systems. Since removing your vehicle’s factory emissions components is highly illegal, the previous two options are more common. However, header-back systems are still available for some older, pre-emissions applications. In these cases, header-back systems offer more performance and volume than cat-back or axle-back systems |
