Quote:
Originally Posted by winkosmosis
With your home built car, I hope you would use a catalytic converter, otherwise pollution will be much much worse. I believe a small 2 stroke scooter emits something like 10x the pollutants other than CO2 as a car.
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I will be using a cat and all emissions with the honda engine, they don't like running without them and also experience far longer warm up times. The stock cat flows pretty well, and I haven't noticed any gains in horsepower that were worth not having the cat. Typically you gain a little top end but at a loss of bottom/midrange power, it's something I only do for the track to keep the heat out of the engine when you're at WOT so much.