No drone at driving rpm when combined with CORSA Performance Exhaust Systems. 304 stainless steel building. Precision engineered principal tubes optimize physically fit and also overall performance. Car matched port geometry will increase exhaust flow and also eliminates leaks. Headers are shown as well as dyno tuned. Limited Lifetime Warranty. Built in the U.S.A. Long tube headers need a tune to eliminate check engine light coming from oxygen sensor relocation All CORSA headers are made from top quality stainless steel to give long-term performance, physical appearance and also sound. Quick bolt on set up. No welding required. Detailed directions and all hardware are incorporated into each system. CORSA branded headers are supported by a tight LIFETIME guarantee as long as you possess the car or truck of yours with evidence of get. Long tube headers are developed for off road use merely and also need a customized tune to do away with the check engine light due to relocating the oxygen sensor distant relative to the catalytic converter.. ATTN State of California ConsumersWARNING Reproductive Harm in addition to Cancer www.p65warnings.ca.gov 2008 GMC Sierra Corsa Headers...