The best tool is the one that doesn't destroy your engine. Sometimes, paying for the license is the cheapest insurance you can buy.
[Current Date] Source: MHH AUTO Forum (Page 1) Software: Davinci 1.0.28 Status: UNLOCKED Davinci Software 1.0.28 UNLOCKED - MHH AUTO - Page 1
Disables the Exhaust Gas Recirculation valve to prevent carbon buildup in the intake manifold. The best tool is the one that doesn't destroy your engine