Ran across this on YouTube. Does not sound bad at all during acceleration.
Lincoln LS Borla exhaust - YouTube
Lincoln LS Borla exhaust - YouTube
I wonder if those are just Borla mufflers or if it is the Thunderbird Borla CAT back system.
This is my 2004 Lincoln LS V8 with a custom cat-back exhaust. It has a Magnaflow X-pipe, resonator delete, 2.5 inch stainless steel tubing back to Borla S-type mufflers (stingers). This is a cold start and then takeoff.