I have a 2012 800 le that has around 5500 miles on it, and about a year or so ago I noticed one day it just wasn’t running right and the motor just sounded different. Life has just gotten in the way over the last year and I just haven’t had time to mess with it, but now im ready to get it fixed. At first I thought it was the fuel pump but I tested pressure at the rail and it read around 38psi. It fires up and idles perfectly but at full throttle it has 50% of the power it used to have and sounds completely different than it always did, its like a really deep bog/grunting noise. I have also changed the spark plugs and that didn’t help any. Any ideas what else this could be?

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whence