What would happen if l put two of the same Voltage Stablizer(C-West) on my car battery?

Oh and one more question, can a K20A fit on my 4cyl Accord?

a k20 would be no bigger then an F22 found in most accords, so if they make a mount kit for it, then yeah it would fit in there, ive never seen it done, but that doesnt mean it cant, if they fit in civics with absolutely no issue, it would make sense theyd fit in an accord too, ur honestly better off doing the F--> H conversion on it, F22 motors r the only honda motors that can be converted from SOHC to DOHC using a honda prelude H22 head, as far as the voltage stabilizer, ive never heard, or even seen people use them, l dont think the benefits r worth the cost, especially since hondas dont exactly draw a whole lot of power

Voltage stabilizers r worthless. There have been a few write-ups online, where people have taken them apart (not this specific one), only to find a cheap basic resistor. A resistor that u could buy at radioshack for for less than $1. The horsepower gains that they claim r a joke. The horsepower stuff they claim, is usually gained on a car that has deteriorated ground wires. The only thing it will do is help u start ur car easier, & idle a little smoother. Simply buying a cheap ebay grounding/earthing kit, to replace the main stock ground wires, will do the same thing. Or even just replace the ground from the chassis to the transmission, the chassis to the valve cover, & the chassis to the intake manifold; & use slightly bigger wires for them.

Whether the K20A will fit in ur car depends on which car u have. Currently Hasport makes mount kits for the '90-'93 Accords & the '94-'97 Accords. Other than that, l am sure it can be done in a newer than '97 Accord, but getting it in there might be a little problem.