All Hooker BlackHeart products are constructed of lightweight, 18-gauge, 304 stainless steel material to maximize strength and durability while tube geometry is designed for maximum ground clearance and improved flow characteristics. All Hooker BlackHeart headers feature 3/8" precision water jet cut header flanges for maximum strength and a perfect sealing surface. Both the long tube and shorty headers are available with 1 7/8" primaries, while the longtubes utilize long transition collectors featuring merge spears for increased exhaust velocity and scavenging.