H-Pipe, X-Pipe, 1, 2, 3...
Every muffler manufacturer offers various combinations of inlet/outlet configurations to fit various requirements. What we didn’t know is that these different combinations affect both sound levels and airflow. These Magnaflow mufflers are arranged from left to right in order of highest flow and loudest sound level: center/center, parallel offset, center/offset, staggered/offset. The variation in flow from best to worst is only about 10 cfm, so this isn’t a big issue.
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