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While you'll find a complete breakdown of the parts we tested elsewhere in this article, we have to give props and sincere thanks to all of the aftermarket companies that participated. Improving induction and exhaust is the essence of most entry-level bolt-ons. For our study of the products' collective worth, selection was based on availability of parts. This means a piece that can be purchased for a Fox has to be available (from the same company) for an S197, and so on.