MA State Police car information: 1992-2006
1992-1993: Ford Crown Vic, with Whelen Edge light bars, no center light. Siren speaker on pushbar.
1994: No cruisers (Massachusetts Turnpike only).
1995: 9C1 Chevy Caprice, Federal Jet Strobe light bar, oscillating center light.
1996: Ford Crown Vic, Federal Jet Strobe light bar, oscillating center light.
1997: Ford Crown Vic, Federal Vista light bar Oscillating center light.
1998-2000: Ford Crown Vic, Whelen light bar, dual center
strobes one atop the other (looks like only one unless you're close or it's on).
2001-2002: Ford Crown Vic, Whelen light bar, dual center strobes side-by-side.
2003-2004: Ford Crown Vic, Code 3 Excalibur light bar.
2005-2006: Ford Crown Vic Whelen LED light bar.
Info Thanks to "352".