Who makes custom test pipes and where can I contact them? Im looking for someway to connect a 2.5" header to a 3" thermal exhaust. Right now I have my stock header welded to a 2.5"-3" cat are there any 2.5"-3" flex pipes I can replace this with? Im trying to avoid welding the header to the exhaust so I can easily unbolt them.

 

you can make your own with parts from Autozone.