This appears to be an old subject here, as most postings I've found date back to 2007/2008.
All the exhaust shops I've spoke with, start doing the same dance, when asked to build me one. They first kinda look like a slug that's just been covered with salt! Then they start looking around to see if anyone heard me. It's like the EPA has all the shops 'bugged' with video and audio!

And the stores on line, that I've tried, don't seem to carry them any longer.
I've got a '81 Spider, with 4 bolt flanges. Anyone know where I can get a test pipe?
Thanks ...