This Is A Set Of Brand New Big Block Gt40 Headers With True 180 Deg Tube Timing (no Mufflers Needed). They Will Fit A Stock Stile Chassie, Please Contact Me To See If It Fits Other Style Chassie. The Headers Are Made Frome Akdq Alloy Steel Tube, If Coated Properly Will Last As Long As Stainless And Look Better Doing It. They Have 3/8 Flanges That Are Surface Ground After Tig Welding They Will Not Deform Aluminum Heads And If Instaled Properly Will Not Leak. Please Email Me For More Info And Fit.