Dyno Don's are the only ones that I'm aware of. They're a little pricey, but all the feedback indicates the fit and quality are top notch. For description and photo reference, these are ceramic coated, have air tubes, and a 2.5" ball collector ($605), but Dyno Don can make them however you want them. http://www.top-downsolutions.com/in...mp;manufacturer_id=34&product_id=247
These are without air tubes $565http://www.top-downsolutions.com/in...mp;manufacturer_id=34&product_id=248
I know he's put a 3" header flange on some before but not sure if he'll sell them without the coating or not. If the you want anything different, he frequents thirdgen.org and could be reached that way.