# Catalytic converter flange nuts, both ends (NA 1.8)

Canonical URL: https://miatatorque.com/spec/catalytic-converter-flange-nuts-na-bp/

Applicability: NA 1994–1997 (BP) — Other years in this family inferred from 1994 factory evidence with owner approval; actual-year verification is separate.

Confidence: fsm

28–38 ft·lb / 38–51 N·m

Always confirm against your factory manual. Match every restriction and follow all stages and procedure notes. Disputed claims must not be automatically resolved. The complete record below preserves every printed unit, source claim and procedure.

```json
{
  "id": "catalytic-converter-flange-nuts-na-bp",
  "name": "Catalytic converter flange nuts, both ends (NA 1.8)",
  "aliases": [],
  "applies_to": [
    {
      "gen": "NA",
      "years": [
        1994,
        1997
      ],
      "engines": [
        "BP"
      ],
      "note": "Other years in this family inferred from 1994 factory evidence with owner approval; actual-year verification is separate."
    }
  ],
  "kind": "torque",
  "torque": {
    "nm": [
      38,
      51
    ],
    "kgfm": [
      3.8,
      5.3
    ],
    "ftlb": [
      28,
      38
    ]
  },
  "procedure": {
    "replace": "Replace inlet and outlet flange gaskets."
  },
  "confidence": "fsm",
  "sources": [
    {
      "source": "fsm-1994",
      "page": "F–128 (PDF p. 277)",
      "as_printed": "38—51 {3.8—5.3, 28—38}\nN·m {kgf·m, ft·lbf}",
      "verified_years": [
        1994,
        1994
      ],
      "torque": {
        "nm": [
          38,
          51
        ],
        "kgfm": [
          3.8,
          5.3
        ],
        "ftlb": [
          28,
          38
        ]
      },
      "document": {
        "id": "fsm-1994",
        "tier": 1,
        "title": "1994 Mazda MX-5 Miata Workshop Manual",
        "covers": [
          {
            "gen": "NA",
            "years": [
              1994,
              1997
            ],
            "engines": [
              "BP"
            ]
          }
        ],
        "note": "Mazda's base manual for 1994–97; later model years got supplements, which we haven't checked yet."
      }
    }
  ],
  "jobs": [],
  "system": "exhaust",
  "component": "gap-followup-2026-10",
  "componentName": "Additional factory manual gap audit",
  "sequence_diagrams": [],
  "url": "https://miatatorque.com/spec/catalytic-converter-flange-nuts-na-bp/"
}
```