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Recently I was helping a friend work on his set-up (non-Mopar) with a terrible drone. He tried different mufflers without much help. We added an H-Pipe (more to help with the low end torque than the drone) and it did affect the drone slightly. We tried something a bit off the wall. He had...

H-Pipes inherently improve low-end torque by balancing exhaust gas pressures between the the sides. Most push-rod motors can benefit by using an H-Pipe. X-Pipes tend to blance the flow between both sides and can increase horsepower on higher revving motors. The modern modular motors see...