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.

Previous:What are the advantage of buying these two machines of engine depth carbon removal?

Next:What are the conditions for becoming your distributor?