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OBD Diagnostics, Inc. "MEFI Scan & Tune" software for PC

No first hand experience but have a buddy that uses it for his race car applications.

I can speak to the Rinda stuff - it used to be what all the brand name marine engine makers provide to their servicing dealers (recommended tool of choice) and what most service schools use...

are you looking for a stand alone tool or do you want to reprogram the ECUs?
 
Ability to change variables would be great, especially after any mods were done. I think anyone can download a free "data logger" from them or others if you merely want to see what is going on or spot problems to diagnose. Ability to actually "tune" ecm is helpful.
 
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