The dual-plane manifolds tend to have significant differences in flow from port to port since the runners vary in length and shape. We wish Indy would make this manifold with a 4500 bolt pattern.

A rare 1964 Dodge Polara 500 Max Wedge owner spends $20,000 to secure original 40-lb Tri-Y exhaust manifolds, preserving Mopar history. F or Mopar enthusiasts, authenticity comes at a price—and ...