Popular Hot Rodding had an article in June 1990 highlighting Turbo City’s TPI performance system. The kit included a new y-pipe, cat back flowmaster exhaust, K&N air filters, underdrive pulleys, spark plug wires, PROM, and a TPI air foil. While they did not give specifics, the test car, a 1989 5.0TPI convertible with a T5 ran low 14’s with the kit, apparently over a 1 second reduction in ET.
Enjoy!
thirdgenfbody 
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