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This was a significant problem with the 6.4 Powerstroke, especially in the beginning. If you are having this problem, you could try unclogging it with a DPF cleaner and a DPF cleaning kit. Out of the box, the 6.4 Powerstroke was rated for 350 horsepower, but it’s possible to get as much as 500 horsepower or more by replacing stock parts with 6.4 diesel performance parts. The successor to the 6.4 Powerstroke was the 6.7, rated for 390 horsepower. Loudness can be a pro or a con depending on your taste
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