Construction is mandrel bent tubing for performance and 100% T304 stainless steel (polished tips, end pipes and mufflers, matte piping) for long life in any climate. Our unique "Double Y" pipe uses an elliptical join to create synchronized gas flow without the restriction of traditional "H" or "X" pipes. We hand fabricate straight through mufflers using an exclusive space age packing material for a pleasing yet responsible sound level. The end result is increased torque and power and faster spool up for turbo models. Three tips are available: the hot STILLEN "ZR", the traditional single bullnose, or stealthy dual tips. The STILLEN exhausts for the turbo and non turbo Z are the best performing systems available.