Hey bud! What part of MD are you from? As for the tune, yes you do. Car will run but not to its full potential without it, and in the case of the converter, you might enter trans limp home mode.Do i need to get my computer flash if i install a 2600 stall convertor?? have lt4 hot cam kit, headers, have had comp tuned for the idle and a few other things already. is 2600 a good stall??