Does anyone know who sells a 3" dp allready made for a 4 bolt exhaust housing, or does this have to be fabbed?

 

I think max-rev.com has them. I also would like to know because I need one as well. They dont look that hard to make. Would it be bad to just get a muffler shop to custom make one as long as I have some flex pipe and an O2 bung in there??