Delkevic header came in today. Installed immediately.
Here's the good and bad.
The bad: Not a straightforward fit, but it was for up to 2021 I believe. It had an extra mounting tab on it that poked under the bike, that my Scram head pipe did not have. I could see where it was supposed to bolt on, but the hole was a good half inch off. Sawzall action took care of that, since my stock head pipe didn't have it anyway.
The shape wasn't exactly the same, but dang close and the 02 sensor screwed right in. In order to get the header pipe to seal to the exhaust gasket/o-ring flush, it hung a tad low. To hang it "stress free and sealed", I had to fix a bracket to fit the PoweRage muffler. I didn't test fit the stock muffler to see if it fit differently. Regarding the slightly lower muffler, I went corner carving today and it didn't scrape or drag so it's clear. That said, I will take it off the have my local muffler shop tweak it a little to get it hung without a bracket. No biggy.
The good:....and there was a lot. The thing looks super-clean without the discolored cat bump. It really helped the appearance of the smaller PoweRage muffler. Speaking of which, the muffler now sounds better, deeper. More resonance. Not so "farty" that I complained about. You can definitely tell the bike is breathing better now. The other bonus is, I know another member here said their bike ran worse with it, not so in my case. Bottom through mid-range has a nice sweep now and better throttle response. More power? I doubt it, but it acts better and more responsive. The other big bonus I noticed? That "post-mid-range Death Rattle" I've been trying to stifle has diminished 70+%. I doubt the cause have gone away, but apparently the cat seemed to be accentuating the noise somehow, is the only thing I can think of. The bike is smoother and better across the board now, plus less mechanically noisy. All good things. Mind you, this may not be your case if you install one, just what I noticed right from the get-go.
I've now done the PoweRange muffler, and yesterday the DNA filter. Both of those helped the bike "over stock form" in areas. The header seemed to bring them all together.