Trac and engine light is almost certainly due to ABS module. There is a Tacho plug in the engine bay, near the firewall on the passenger side, along that big bunch of wires up top. As for exhaust basically anywhere can give you an exhaust, go around locally and get prices or if you can install it yourself then hit up Not_An_Abba_Fan here on the forums.
-Democracy must be something more than two wolves and a sheep voting on what to have for dinner.
James Bovard, Civil Libertarian (1994)
-Giving money and power to government is like giving whiskey and car keys to teenage boys.
P.J. O'Rourke, Civil Libertarian
-Government's view of the economy could be summed up in a few short Phrases: If it moves, tax it. If it keeps moving, regulate it. And if it stops moving, subsidize it.
Ronald Reagan (1986)