1991-1994 -- oval tips (with small round outlets) [Battlestar Galactica tips -- OUCH!] -- screw-on tips
1995-2001 -- round 3-1/2 single wall tips (welded on)
2002+ -- round 3-1/2 screw-on tips (resonated?)
In 1995, they also redesigned the muffler unit, for unknown reasons (OBD-II ??). The 95-01 system also weighs 2 pounds less.
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seems like the new 02-style tips might replace the old oval rocketship stuff
[This message has been edited by cojones (edited 01 February 2002).]