Quote:
Originally Posted by xntrx
You'd need a wideband to know for sure. Since you can't tell, assume its not going into it. That mpg is about right or that. Start easy, check the clutch and brake pedal stops, and vacuum leaks (unlit propane, or incense/cigarette). Report back, and we'll go from there.
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I will do that once I replace the exhaust. As I understand it, a bad exhaust can ruin a good 5 wire O2 sensor. To that end, do I need to buy an OEM muffler, or can I simply use an aftermarket equivalent?