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You can't use leaded fuel at all if you have a catalytic converter. The lead will slowly hurt your O2 sensor, but if your O2 sensor is in ok shape it should still last you a couple years with often summer weekend use of the leaded fuel. You might have to replace your O2 sensor every couple years if you use leaded a lot, but thats just a cost of racing. Fouling plugs is another small problem, but we usually bring some with to the track or dyno and put them in before even wasting a run on the leaded fuel.
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Yeah I thought about the cat thing and am more than glad I don't have one. Now with needing to replacing an o2 sensor every two years does anyone know the cost of the Bosch wideband used in the kit MachV sells for 350? I have one of those kits on the way and just want to know ho much that sensor costs on its own, seeing as how I may be needing them in the future and can't find a price anywhere..