Perfect Fit Includes stainless steel clamps for a leak - free seal and heavy - duty 5 - Ply polyester reinforced silicone hump coupling for strength. Mandrel - bent Tubing Constructed of 2 - 12 to 3 mandrel - bent aluminum tubing then powder - coated wrinkle - black for heat and corrosion resistance. The smooth transition mandre l bends decrease turbulence which increases horsepower and torque. The high - temp wrinkle - black powder - coating insulates the tubes from engine heat and protects them from corrosion. Two 18 NPT ports are provided for sensors or water - methanol injection. aFe Badging Unique aluminum laser - cut aFe Power logo plate is welded - on for an aggressive style.