Vibrant 90 Degree Aluminum Piping, 4.5" O.D. - Polished - 2946 Paint & Touch Up you've noticed a curved "bellmouth"

you've noticed a curved "bellmouth" profile at the inlet of each intake runner

5 D15B2 88-91 Honda CRX HF 1

The solution to that problem is polyurethane exhaust hangers and just in case simply stiffening the hanger isn't enough

6 B16A88-91 Honda CRX DX 1

TIG-welded to a highly efficient bar-and-plate core

Vibrant 90 Degree Aluminum Piping, 4.5" O.D. - Polished - 2946 Paint & Touch Up you've noticed a curved "bellmouth"Centerline Radius: 6. 750" Leg Length From Tangent: 4. 000" Wall Thickness: 2. 3mm Vibrant Performance offers a complete range of lightweight, top quality 6061 Aluminum Tubing available in a wide array of sizes ranging from 3 4 to 5" (19mm to 127mm) O. D. Our Aluminum Tubing comes in a variety of bend configurations (30 to 180 degrees) and are suitable for use in both pressurized and naturally aspirated applications. The Vibrant Performance Aluminum