TST designs, manufactures, tests, and markets power upgrades for turbo diesel engines used in many Dodge, Ford, and GM pickup trucks, motorhomes and medium trucks, plus heavy trucks with Caterpillar and Cummins electronic diesels.
"We extensively test all products before adding them to our product line, we do not want to sell anything that does not perform well for our customers."
The business was founded in 1995 by Mark Chapple, a former Cummins engineer with 33 years of service. Mark and Gina sold their first parts at a diesel rally in July 1996.
TST markets mainly by mail order and internet, but has about 500 dealers worldwide.