a friend and I are looking to experiment with an electrolysis cell to produce Brown's gas (hydrogen and oxygen together), to be fed into an automobile engine. We were thinking of using my '89 volvo 240, which is fuel-injected. The question I have is, should I feed the gas in AHEAD of the air mass meter, or AFTER it (into the intake manifold, for example).... I can think of good and bad arguments for both, so am wondering what experience anyone else has had....