| Part Number | Inlet/Outlet | Shield | Air | OEM Number |
| BN-646A | dual 3 bolt inlet, dual 2 1/4" outlet | w/out shields | right side air | 92811321901 |
| BN-646B | dual 3 bolt inlet, dual 2 1/4" outlet | w/shields on front pipes | center air | 92811321200 |
|
measurements required |