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

TD-501 also has carbon removal function, why buy HHO-1500?
Update Time:2019-03-20
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.