DieselTech Aluminized Steel ID-OD Exhaust Pipe Adapter 5" ID, 4" OD, 6" Length

AP Products 8958 Exhaust Pipe Reducer

CXRacing 2.5"-2.25" Stainless Steel Manifold Header Reducer Pipe Tube Polished

PFAB 2.5" to 3" 304 Stainless Steel Flare, Reducer, or Transition Pipe. 2.5"-3"

CXRacing 4" to 3" 304 Stainless Steel Reducer Jointer Pipe Tube Manifold Header

CXRacing 2.5" to 2" 304 Stainless Steel Reducer Jointer Pipe Tubing Tube 3" Long

CXRacing 3" to 2.5" 304 Stainless Steel Reducer Jointer Pipe Tubing Tube Header

CXRacing Universal 2.75" to 2.5" OD Aluminum Reducer Pipe 2mm Thick 3" Long Tube