Stainless Steel
Leading experts in performance cars have all the statistics on by how much particular makes and models cars can be improved if you have certain exhausts fitted. For further reading please do a search engine search and you'll find lots of information out there about which exhausts to purchase if you're looking for a particular power increase. But it would be a fair to say that many car modifiers would make the decision to purchase a particular stainless steel backbox based upon looks alone.
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