With Race Inspired Technology built into every system; you're looking at the very best the performance exhaust industry has to offer. Our C5 systems are available with 1-3/4 or 1-7/8 primaries and your choice of 3 x 3 or 3 x 2-1/2 catted or non catted X-pipe mid-section. Of course, these are manufactured using the highest quality 304 S/S available and require no modifications to install. With Race Inspired Technology built into every system; you're looking at the very best the performance exhaust industry has to offer. Our C5 systems are available with 1-3/4 or 1-7/8 primaries and your choice of 3 x 3 or 3 x 2-1/2 catted or non catted X-pipe mid-section. Of course, these are manufactured using the highest quality 304 S/S available and require no modifications to install. All American Racing Headers are engineered and constructed using 304 Stainless Steel and are fabricated with precision cut, 3/8-inch warp-resistant and leak-free stainless steel flanges. Each primary tube is sized for the individual engine output to generate the greatest horsepower with the least amount of compromise created by tight engine bay parameters. Efficient flowing, state-of-the-art merge collectors that are tuned for HP and torque maximization are used in each application. Each header design has been tested in the extreme to ensure it delivers the performance gains we promise and youd expect. ARH Headers are made here in the USA! American Racing Exhausts are Constructed with hi-quality 304 Stainless Steel Components and Tubing. Frequently Asked Questions: Are 02 Extensions Included? Corvette, GTO and Chrysler cars and Jeep SRT8 require extensions and are sold optional. Other cars they are included. Do Headers Include Gaskets? GM and all Chrysler systems include gaskets. Gaskets are not provided for Ford cars and trucks because they''re reusable. Are Bolts Included? Bolts for the cylinder heads are provided for everything but GM vehicles. The factory GM bolts are re-usable. *** NOTE: Not legal for use on pollution-controlled motor vehicles. For off-road use only.The use of long tube headers with aftermarket cats, powerflo-x,hpipe,xpipe crossover pipes with or without aftermarket cats or aftermarket cats are illegal for installation and use on emission-legal vehicles when operated on public streets or highways. They can only be legally used while participating in sanctioned motorsports racing events.