AND
MODEL
INDEX
| Part Number | OEM Number | Cover on Flex | Sensor | Body Ridges | Additional Info |
| BN-487B1 | 012A | w/out cover | w/out sensor | 11 ridges on bottom | flat body |
| BN-487B8 | 341A | w/out cover | w/out sensor | 10 ridges on bottom | flat body |
OEM# and measurements required
2 BOLT OR 4 BOLT INLET, STRAIGHT OR TWISTED; SQUARE OR DIAMOND SHAPE FLANGE; WITH OR W/OUT SENSOR; LOCATION OF SENSOR; NECK, BODY, & REAR PIPE LENGTH