RTP-030 Exhaust Muffler Tip Round Forward Slash Cut Rolled Inward Double Wall 2.25" Inlet / ID, 4" Outlet / OD, 6.125" Length. Red Tail Performance Exhaust Tip Designed and built for the true enthusiast, Red Tail Performance exhaust tips are made from T304 stainless steel material, providing optimal durability that continually maintains its aesthetic appeal. These exhaust tips will never rust, show corrosion, or discolor. Built on the principles of quality, durability, and reliability, Red Tail Performance exhaust tips will meet and exceed even the most discerning of individuals. Unlike single wall tips, double wall tips are manufactured from a pair of tubes rather than a single tip, which are pressed to form an angle cut or round edge design. Precision is extremely important in the design and construction of these tips so that fitment and design are not adversely affected. Our Red Tail Performance double wall designed exhaust tips were carefully developed with the goal of dispersing heat faster, allowing the tip to stay cooler than the standard single wall exhaust tips. With our double wall designed exhaust tips, not only do you get a cooler tip, but you also get a tip that will accentuate the look of your car. Although more expensive than single wall exhaust tips, these additional costs are more than justified when considering the extra material, labor costs, and additional required precision associated with the manufacturing of these tips. Our Black Series Tips are completed with the finest attention to detail. The coating on each of our these exhaust tips are coated electrostatically, and cured under finely measured heat to produce the ideal skin and look. Unlike other manufacturers, all of our coated tips are made with the finest most durable T304 stainless steel material. In other words the same quality you see on the outside runs parallel to the quality you can expect on the inside.