Stainless Works 2003-11 Crown Victoria/Grand Marquis 4.6L 2-1/2in Exhaust S-Tube Mufflers2003 11 Crown Victoria Grand Marquis 4. 6L 2V 2. 5" Catback Exhaust with dual turbo S tube mufflers, dual 3. 5" diameter polished factory style tips. Fits flanged factory connection points and works with manifolds or Stainless Works Headers with leads. Sounds great with factory manifolds and cats, but aggressive sound for headers. This Part Fits: Year Make Model Submodel 2003 2008,2010 2011 Ford Crown Victoria Base 2003 Ford Crown Victoria LWB 2003