"Twisted Steel Headers are constructed out of 304 Stainless Steel for maximum durability. aFe headers are designed with mitered collectors extend tube lengths, decrease turbulence, but provides optimum exhaust scavenging for improved throttle response, power and torque. Primary tubing can vary in between 1-3/4"" to 1-7/8"" of an inch depending on the application, while the flanges are precision laser cut for the ultimate leak free seal. Twisted Steel Downpipes are made out of 304 Stainless Steel for maximum durability. High flow cats are utilized for increased airflow and horsepower. 100% TIG-welded for superior strength derived from racing. aFe V-band flanges ensure a leak free seal and easy bolt-on hassle free install. | aFe Twisted Steel Shorty Headers 48-32023"