AGP Turbo 4.21″ Marmon V-Band Turbine Outlet Kit for BorgWarner S200 and S300 to 3″ Tube

This is the V-band outlet kit for BorgWarner S200 and S300 turbos with the 4.21 Marmon outlet. This includes the V-band clamp and stainless steel weld flange that allows a 3″ OD tube to slip fit inside. Yes, you read the description correctly: We have created an industry-standard 3″ outlet kit for the popular S200SX and S300SX turbos for the factory BorgWarner John Deere–style turbine housings. The OD of the flange is 4.21 and is tapered.

BorgWarner decided to call V-band flanges and clamps by their original name from the early 1900s: Marmon or Marman (they have been spelled both ways). A Marmon flange simply means that there are 2 machined surfaces connected with a clamp. BorgWarner offers 2 styles of Marmon flanges on their housings, 3/4 and 1/2. The 3/4 Marmon has a flange with an angle on it and is not flat. A 1/2 Marmon means the flange is flat. The 3/4 Marmon flanges are common on the S200SX, S200SXE, S300SX, and S300SXE factory T4 turbine housings. The 3/4 Marmon is also used on the T6 S400 housings. The 1/2 Marmon flanges are found on the T4 S400 and T6 S500 factory housings, as well as the S400 compressor outlet flanges on the standard Series 60–style housings.