TD-501 also has carbon removal function, why buy HHO-1500?

TD-501 also has carbon removal function, why buy HHO-1500?

Because the TD-501 can not only remove carbon, but also clean the three-way catalytic converter and the intake manifold, but it needs to dismantle the engine when removing the carbon, and the HHO-1500 can directly remove the carbon needn’t to dis-assembly the engine.