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The extremely costly mandrel bends for performance exhaust systems prevent pipe diameter from fluctuating during bends; learn about mandrel bends in thisfree auto-repair video. Expert: Doug Jenkins Bio: Doug Jenkins runs Doug Jenkins Custom Hot Rods in St. Louis, where he restores classic cars and creates mild to wild custom street rods. He races a 1972 Corvette in the SCCA performance rally series. Filmmaker: Ross Safronoff
Performance Exhaust Systems: Car Restoration Tips : How to Fit Pipe for Performance Mufflers

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