Warpman89 Posted October 21, 2007 Share Posted October 21, 2007 I have a 1988 R688ST with the E6 350 hp. Is there a cheap way to increase the power possibly by turning up the injector pump, or is that not recommended?Also, I have the 12 speed mack tranny, does anyone know what model # it would be?Thanks Quote Link to comment Share on other sites More sharing options...
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