Bill,
Power Edge can reprogram your box as well... . The defueling feature is only active in levels 1-4 on the Comp race model or DD-UFM Competition model. Normally the box starts defueling the engine around 2700 rpm to help control egt's. In level 5 on the hot boxes it doesn't defuel so it allows you to continue to build power or hold it.
Hope this helps,
Doug