I’ve got the IP turned up a tad , new fuel pin, gov spring , slightly larger injector nozzles, about to do a super HX30W, currently aftercooled with the factory JWAC system…have you considered fueling options and more air flow/boost to the 4bt?? slight power bump and tune may get you what you seek?? if not yeah - 6BT in an 80 would want a new HD frame rails