I would never go to a shop when people just TOLD you that he's trying to screw you.
You don't need to check for exhaust leaks if you put the exhaust on yourself. Just tighten to 20ft/lbs. Again he's trying to screw you.
And fuel/air ratio is not adjustable so I don't know why he would want to check it.
But if you have money to waste just do it. Why bother asking the questions in the 1st place?
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