This part fits directly onto the throttle body on my 2008 Kia Sedona 3.8 liter engine. You don't need to add silicone gasket or other gasket unless there is severe wear on the mating surfaces. I torqued the throttle body bolts to 140 IN lbs and had a good seal. I was confident that each bolt turned, increasing the torque evenly by 20 IN-lbs at a time.
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