Holley/MSD is pleased to announce the release of Hooker BlackHeart 2015-17 Shelby Mustang Long Tube Headers. Compatible with both GT350 and GT350R models, they're engineered to fit factory exhaust systems with BlackHeart link pipes (part number 70503354-RHKR or 70503355-RHKR) and are fully compatible with four complete exhaust systems (part numbers 70503350-RHKR, 70503351-RHKR, 70503352-RHKR, or 70503353-RHKR). BlackHeart 2015-17 Shelby Mustang Long Tube Headers are made from mandrel-bent 18-gauge, 304 stainless steel for maximum strength and durability and feature 1-3/4-inch-diameter tuned-length primary tubes and long-transition 3-inch collectors with merge spears for optimized flow and increased exhaust velocity. Every piece is 100% hand-welded, tube geometry is designed for maximum clearance, and factory-like mounts accept OE vibration dampeners. They come complete with O2 sensor extension wires and all the necessary hardware for a fast, easy installation.