Daul exhuast will add horse power and if you add a seperate muffler and converter, it should even be quiter. Is it legal in Iowa to make that type of madification. Tennessee allows it in my county. We don't even get annual inspection. I believe that Iowa has a tighter view of exhaust. The O2 sensor measures the percentage of Oxygen, and along with other sensors determines how much air the engine recieves to fuel. The percentage of oxygen to exhaust gas from haf the engine should be the same as from the total exhaust, Though I would only put the O2 sensor on one side. If you, however, must be inspected annually and they visually inspect this stuff, I wouldn't bother doing it, as you will be changing it out to get your sticker. I'll share a cool story. New Hampshire required that a rusted through hole is a failure. They salt the roads. I had a very old pick up, that because of it's age beats the emission rules, but had plenty of rust holes. Just before I would go to get my inspection, I would sling drywall compound all over the rust holes. I always got the sticker, though the next rain would wash away all the "body compound". Because the local mechanic knew I did sheetrock, it looked like I was just a messy one. Maybe he knew, maybe he didn't, but I got my sticker.
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Today's Featured Article - Earthmaster Project Progress Just a little update on my Earthmaster......it's back from the dead! I pulled the head, and soaked the stuck valves with mystery oil overnight, re-installed the head, and bingo, the compression returned. But alas, my carb foiled me again, it would fire a second then flood out. After numerous dead ends for a replacement carb, I went to work fixing mine.I soldered new floats on the float arm, they came from an old motorcycle carb, replaced the packing on the throttle shaft with o-rings, cut new ga
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