These guys make really nice stacks for 70's era Honda bikes. I had them custom make me a set for my Tri-power EFI set-up I was doing. They are super good guys and really reasonable price wise. I am sure they could make just about anything. Also available in brass. http://www.steeldragonperformance.com/ Most sets of 4 are between $60 and $80!!
Ok, I'll be the one to do it, FNG's, read it, learn it, love it. http://www.jalopyjournal.com/forum/showthread.php?t=742511 Yes, I'm an asshole. Yes, I'm ok with it.
i'm not sure i agree with doing it just for looks, but here you go: http://www.alsblowers.com/streetinduction.html