I went with the Pypes 2-1/2" Stainless/ X-pipe/ Race Pro Muffs, for my 68 Barracuda. The price was very reasonable and it's mandrel bent. It was less expensive than the locally non mandrel bent 2" system EDIT plain muffler moly, non aluminized I had installed many years ago. Even factoring in the install, the Pypes system is a much better deal. YMMV.