I don't have an extension for the MAF harness. It was wired directly by previous owner without using one. The noise wasn't that bad once I built a divider with RAAMmat and ensolite. There's a few posts in the forum where others have done the same thing. I mean, you still know it's there, but it's not blasting your ears off. I would use it again but needing the money.
Might have some more of the mat too if your interest is piqued.