Khrome Werks Aggressor 2 Into 2 Crossover Headers For Harley Touring The Khrome Werks Aggressor 2 into 2 Headers provide a classic look while featuring a hidden crossover pipe that utilizes scavenging effect to increase horsepower and torque. Sized to work with stock mufflers and OEM replacement slip-ons, the Aggressor Headers include heat shields for a finished look. Features: Hidden crossover pipe that utilizes scavenging effect to increase horsepower and torque 1-3/4 16-gauge headers with a 1.875 crossover for improved horsepower and low-end torque Includes 2-1/2 diameter heat shields Classic true dual look Hyper-secured to handle expansion and vibration 18mm and 12mm O2 bungs welded into the primaries Designed to work with Khrome Werks and OEM replacement slip-ons