This is a core charge for customers who need a modified throttle body prior to sending theirs in. However this charge is refunded once your throttle body is mailed into us. A 30% re stocking fee applies to your refund upon arrival of your stock throttle body to our facility. This is to compensate for time taken for testing and to re gasket the electronic portion of the throttle body. (This process ensures the next customer will have a fully sealed / functional throttle body.)