You could try cleaning your o2 with carb cleaner or air Intake cleaner. I'm going to do the old ghetto trick of using a spark plug defouler to get the o2 out of the direct flow. That's supposed to work. I have friends with aftermarket headers on their cars so I've been asking around for their stock manifolds. I'll deffinetly let you know what I figure out. But man. This mpguido is sweet. I'm almost positive I was in lean burn on the highway. But In Austin Texas it's very hilly and I get way more milage from pumping the hills then using lean burn it looks like. But still I'm having so much fun pushing this thing to the limit!
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