I have a 2004 FLSTFI FATBOY with Vance& Hines staggered big shots pipes. I'd love to find a nice set of original equipment Harley Davidson pipes,like the ones that came on the bike from the factory. Maybe a swap one for one.
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I put a set of V&S BSS on my 06 Heritage almost 19 years ago and never looked back. I like both the looks and the sound. I thought about buying true duals for it but decided to leave it alone. If you haven’t done so already, check eBay, I have found a lot of used parts for my bike. Good luck.

 

I think I still have the takeoff stock pipes from my 2005 Fatboy. I took them off and wrapped them up in bed sheets to protect them after approx 500 miles, so they'd be in great conditionI believe those will fit your 2004. I'll look when I get home.

 

I did the same with my 2002 FB when I got it. Way too loud and obnoxious for me.
My bike came with the OEM take offs, so I did not have to go searching.
Hope it works out that Mr. Bopple has what you need. I like the low rumble of the OEM.
I thought the V&H's I removed would sell but no interest at all. Scrap metal.

 

And if he doesn't , I have a set of from an 05 Nostalgia ( FLSTN)