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Just put headers and a cam in my car no cats and a loudmouth exaust it is smoking when you start it and smokes a little when it is idleing no tuning has been done to the car it is a 2000 with 23,000 miles is this normal?
How long since the install? It might just be the fluids and grease from your hands burning off the engine stuff, in which case, it will eventually go away.