Elevate your exhaust setup with BBK's 2-3/4 Inch Exhaust Flow Tubes (PART #14670). These aluminized steel, CNC-formed tubes are designed to maintain or repair your car or truck’s exhaust path from the mid-pipe back, delivering precise flow and reliable connections for crossover mufflers and related components. Built for longevity and consistent performance, they’re a smart upgrade to keep your system breathing freely under pressure.

The 2-3/4 Inch Exhaust Flow Tubes measure 12 inches in length and feature a 2-3/4 inch outer diameter, expanded for universal fit with 2005 and Newer BBK 1-3/4 - 1-7/8 full-length header collectors. They include two ball-with-socket flanges, collector brackets, and O2 sensor bungs welded in place, ensuring a seamless, leak-free installation.

Key specifications and features

• 2-3/4" OD exhaust tubes, 12 inches long
• DO NOT FIT 1987-2010 - BBK 1-5/8 or 1-3/4 Long Tubes PART # 1516, 15160, 1594, 15940, 1569, 15690, 1641, 16410
  
• Includes two ball-with-socket style flanges and collector brackets
• O2 sensor bung welded in place for quick, leak-free sensor integration
• Collector Bracket - Center measurement: 4 inches
• May require trimming to final fitment in some applications
• Flared female connection recommended for larger 2005 & newer BBK 1-3/4" primary tube collectors

Why choose these flow tubes

Designed specifically to work with BBK products, these flow tubes offer a reliable, race-tested path from the mid-pipe back to your crossover mufflers. The built-in O2 bungs mean you won’t have to add sensors later, reducing install time and potential leak points. The included collector bracket ensures a secure, stable connection, helping maintain exhaust routing under load and vibration. If you’re upgrading from stock tubing or repairing a damaged mid-pipe section, these tubes provide a clear, direct upgrade path that maintains proper scavenging and exhaust flow.

Who this is ideal for

• Performance enthusiasts upgrading to BBK long tube headers
• DIY mechanics performing mid-pipe-back exhaust repairs
• Fender-to-frame routing projects that require precise 2-3/4" tubing and reliable flange connections
• Shop technicians assembling or reconfiguring crossover muffler systems for improved flow

Use cases and installation insights

Install these tubes when you’re replacing or upgrading mid-pipe back sections and you want seamless compatibility with BBK long tube header systems. The universal fit and standardized 12-inch length make them a versatile choice for a range of vehicles. Expect a straightforward install if you’re pairing with BBK ball-and-socket collectors; you’ll benefit from the welded O2 bungs, which simplify sensor placement and sealing. If you’re fitting to a vehicle with 1-3/4 inch primary tube collectors, the flared female connection is recommended to ensure a snug, leak-free interface.

Practical tips

• Double-check your existing header primary size and collector style to confirm compatibility with BBK 1-3/4" primary tube collectors.
• Plan for trimming in tight-fit scenarios—the tubes are designed for universal fit but may require minor trimming for a perfect seal on some builds.
• Use high-quality gaskets and appropriate mounting hardware when securing flanges to maximize leak-free performance.
• Inspect the welded O2 bungs during installation to ensure sensor threads seat correctly and there are no gaps around the bung welds.

With the 2-3/4 Inch Exhaust Flow Tubes, you get a purpose-built solution that aligns with BBK’s performance philosophy: precise, durable, and ready to pair with BBK Long Tube Headers for dependable exhaust flow from the mid-pipe back. Whether you’re extending your setup, repairing damaged tubing, or upgrading to a more efficient configuration, these flow tubes provide a clear path to improved performance and reliability.