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Welcome, I'm Chris (aka Moose), my normal schedule online is around lunch and after dinner past midnight.
With an exhaust leak you need to check around the exhaust manifolds, joints, and welds to see if there is a sign of black soot which indicates the source of a leak allowing fumes to exit the exhaust and enter the fresh air intake. Sometimes using duct tape to cover 60%% of the exhaust tip flow then pouring a small amount of oil into the throttle body to cause smoke will help you find a leak where the oil smoke exits.
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Hello again Chris here,