HPS Performance Products HPS 2-1/4" OD 110 Degree Bend 6061 Aluminum Elbow Pipe Tubing 16 Gauge w/ 3" CLR Shopify Collective but it's recommended if you

but it's recommended if you want to optimize fuel mapping and oxygen sensor readings for the new exhaust characteristics

due to exhaust resistance

High Sierra 1967 - 1972 GMC C15/C1500 Pickup Base 1967 - 1972 GMC C15/C1500 Suburban Base 1979 - 1980 GMC C1500 Heavy Half 1979 - 1986 GMC C1500 High Sierra

Head only — no bolts

HPS Performance Products HPS 2-1/4" OD 110 Degree Bend 6061 Aluminum Elbow Pipe Tubing 16 Gauge w/ 3" CLR Shopify Collective but it's recommended if youHPS 2. 25" 110 Degree Bend 6061 Aluminum Elbow Tubing 16 Gauge with 6" Leg Length and 3" Center Line of Radius is commonly used in industrial, automotive, marine and aerospace industry; Great for custom fabrication project such as DIY air intake, cooling systems, turbo intercooler piping setup because 6061 aluminum is the most popular and versatile alloy, and is the least expensive of the heat treatable aluminum alloys. HPS 2 1 4" (57mm) 110 Degree