I know this is a old thread but I thought I would share my expearence with Magnaflow, true the piping is 409 ss but the Muffler, res. & tips are 304 ss fit and finish is great, the guy that installed it for me was so impressed with the system hes posting pictures of it on his company FB page. (I'll try to get some sound clips soon) Sound is much deeper than stock and @ wot sounds V-8 like. For $855.00 shipped to my door it was a great deal !
Magnaflow Dual Exit Catback Exhaust System w/X-Pipe Now Available! + FREE S&H!!