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MILS The MILS  come in a set for both banks  which will eliminate the CEL codes since the precats are removed.  Free Shipping Item #NAU-MILS price option without headers purchase with headers price (-$10.00) Price $35.00  Click for details MSDS Headers Shorty Mazda 6 VVT MSDS Headers are dyno proven to gain 20whp 18wtq with factory mufflers with no tuning required. The shorty headers will fit both atx and mtx using the MSDS y-pipe with a flex pipe. Item #NE-1003 Type of Finish Plain Coated (+$35.00) Price $250.00  Click for details MSDS Shorty Headers Contour/Cougar/Mondeo Shorty headers for Duratec V6 engines.  Proven by years of track and dyno results to gain as much as 15whp on NA cars. Item #NE-1000 Type of Finish Plain Coated (+$35.00) Price $250.00  Click for details MSDS Y-pipe Contour/Cougar/Mondeo Y-pipe matches MSDS headers to improve exhaust flow. Item #NE-1001 Type of Finish Plain Coated (+$35.00) Bolt Pattern 3 Bolt CAT 2 Bolt CAT Price $225.00  Click for details MSDS Y-Pipe Mazda 6 VVT The y-pipe works in conjuction with the MSDS Headers to improve flow and maximize the power while maintaining the factory sensors. Item #1005 Type of Finish Plain Coated (+$35.00) Price $295.00  Click for details