Great for my 99 Tahoe it really made a difference in my throttle response also little better gas mileage. Only thing I notice was lack of quality building it ports were beveled sloppy & welds were sloppy. Also not much of a sound to it but all & all good upgrade stainless steel make it not rust keep engine temp cooler then painted
These are the best headers I've ever installed or worked around. Thick quality flanges. Did not have to fight with original y pipe bolting up, egr pipe bolted right up and nice spacing for the original 90 degree wires. Still recommend the insulator sleeves. Very nice headers.