Up for your consideration is a Vibrant Performance 61210 ... 4" I.D. x 10" weld-on TurboFlex exhaust coupling. Engineered with an internal stainless steel interlock liner, it isolates engine vibration, relieves stress on exhaust components, and prevents premature cracking of manifolds. It is priced between $130 and $153 or buy it brand new from me for just $50.00!
Key Specifications & Features:
Inlet/Outlet Diameter: 4.00" (Internal Diameter)
Overall Length: 10.00"
Material: T304 Stainless Steel (with 409 Stainless Steel cap rings)
Design: Smooth-flowing interlock liner, ideal for high-performance and forced-induction applications.