BN-549A1/BN-549A2/BN-549A3/BN-549A4/BN-549B/BN-549C
(BN-549A1 pictured)
| Part Number | OEM Number | Body | Shield | Neck Length | Additional Info |
| BN-549A1 | P04 | oval | 7 bolts on rear shield | ||
| BN-549A2 | P04 | oval | 4 bolts on rear shield | ||
| BN-549A3 | P04 | oval | w/out shield | small flex is at end of large flex | |
| BN-549A4 | P04 | oval | w/out shield | small flex is at center of large flex | |
| U99 | round | w/shield on bottom | 11 3/4" from weld to flange on neck closest to hanger | pipe reduces down on both front necks | |
| U99 | round | w/shield on bottom | 12 3/4" from weld to flange on neck closest to hanger | pipe reduces down on 1 front neck | |
| BN-549B | round | ||||
| BN-549C | round | w/pre-converter |