I am looking for this exact stuff.

 

http://www.fathousefab.com/products/...h-solid-liner/

 

They are all over. Just do a google/ebay search for stainless steel flex exhaust and you will come up with MANY options. most are braided stainless wire over a stainless bellows. Some are just a bellows, and some are braided stainless inside and out.

However, make sure it's 100% stainless. some use stainless braid with mild piping.

 

Vibrant makes or at least packages one. You may be able to buy from Vibrant direct, but these guys have a good selection of quality DIY fabrication parts.

http://www.verociousmotorsports.com/...tainless-Steel