Features Sequential-fire design maximizes scavenging affect for maximum power. These works of art feature 1-3/4" diameter x 30" long primary tubes that flow into 3" collectors. Straightforward installation doesn't even require raising the engine or removing the starter! Off-road 3" Y-pipe available separately (P/N 16723HKR), and clears frame connectors! It connects up to stock or aftermarket cat-back systems. Slip-fit collectors improve ground clearance. Available metallic-ceramic coating for long-lasting good looks and lower under-hood temperatures (P/N 2254-1HKR). Oxygen sensor and emissions equipment tubes are in place to ease installation. Includes O2 sensor extension harnesses for front O2 sensors. Requires two O2 "simulators" for rear O2 sensor sensors (not included).