This method is like what i've post in the begining "decarbonization using house hold products" <= but later ZTH server got major reset all lost.4. Malaysia Boleh design (by me about 11 years ago on my Satria 1.3M). Proven ok. Tested long distance JB-Kuantan for few trips and also normal city driving. But the maximum volume need to be adjusted according to different car.