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If you've owned any Gen II, III, or IV-powered 1994 or newer vehicles, one of the shown flash memory-based units has been responsible for controlling the powertrain. The evolution of GM's controllers has paralleled that of most other electronics: they keep getting faster, smarter, and smaller. Speartech Fuel Injection Systems, www.speartech.com, is a great source for picking up controllers, tuning harnesses, and even complete injection packages for retro-fits. Speartech is run by John Spears. John is an ex-GM engineer and GM powertrain whiz. His wealth of experience with GM controllers, combined with his passion for performance, enables him to stay at the front of the pack when talking tuning. View Related Article
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