Hey Scotty, I have a 93 Celica 2 liter 3SGE engine. I engine brake all the time, except the engines stopping power is insuffient then I add as necessary regular brakes. When stopping I engine brake until 3rd gear, then neutral and stepping on the brake, not to wear out first and second gear syncros. I downshift only to the point not to exceed 3000 rpm, I also try to anticipate and engine brake until 1600 rpm and then downshift. I mastered my rev matching. Am I doing any damage/unnecessary wear to the drivetrain? Thanks