Hey Flirt,
I'd bet if you took ANY America/Speedy header pipes (JUST for the flanges) to any automotive muffler shop, they could easily bend up the pipes to resemble mikes, or anything similar, for WAY less then buying a set from a motorcycle dealer. Then just slip in some "straight pipe" silencers, or make your own baffles (like I did).
They do it daily for project car systems. I got a custom, duel exhaust, with two large reverse flow mufflers on each side on my El Camino for $200 bucks.