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Diesel Performance Systems sells only the highest quality 4” and 5” aluminized exhaust products on the market today. All of our diesel exhaust systems are manufactured from the highest quality 15 and 16 gauge aluminized tubing. All of the tubing in our products is made in the U.S.A., unlike most of our competitors who import foreign materials from outside the United States. All of our exhaust systems are mandrel bent to ensure the least amount of restriction for the most in performance gain.