Showing specs for all NA & NB Miatas

Exhaust manifold / header

Manifold, heat shield and exhaust pipe connection hardware.

Use this checklist to track fasteners you handle. It is not a complete repair procedure or a verified disassembly order. Follow your factory manual for access, support, tightening sequences and inspections. Select your car and check each variant before using a value.

Checklist: https://miatatorque.com/jobs/exhaust-manifold/
All NA & NB variants; select your car to narrow the list.

You’ll replace

From the recorded replacement instructions; this is not a complete parts list. Also check the notes below.

Fluids & settings

Fluid types, capacities and settings have not been catalogued for this job. Check your factory manual before filling or adjusting.

1. Manifold and heat shield

Exhaust manifold nuts
NA 1990–1997 (B6/BP); NB 1999–2000 (BP-4W)
Factory manual28–34 ft·lb38–46 N·m38–46 N·m28–34 ft·lb
Replace
Gasket
Notes
In the 1990 manual the heat shield (insulator) bolts are 7.8–11 N·m (69–95 in·lb), same page.
  • 1990 Mazda MX-5 Miata Workshop Manual — Page B–83Printed: “38—46 N·m (3.9—4.7 m-kg, 28—34 ft-lb)”
  • 1994 Mazda MX-5 Miata Workshop Manual — Page B–82Printed: “39–46 N·m (3.9–4.7 kgf·m, 29–33 ft·lbf)”
  • 1999 Mazda MX-5 Miata Workshop Manual — Page 01–15–2Printed: “39–46 N·m {3.9–4.7 kgf·m, 29–33 ft·lbf}”
  • 1999 Mazda MX-5 Miata Workshop Manual — Page 01–15–3Printed: “39–46 N·m {3.9–4.7 kgf·m, 29–33 ft·lbf}”
Exhaust manifold heat shield bolts
NA 1994–1997 (BP); NB 1999–2000 (BP-4W); NA 1990–1993 (B6)
Factory manual70–95 in·lbin·lb7.9–10.7 N·m7.9–10.7 N·m70–95 in·lb
  • 1990 Mazda MX-5 Miata Workshop Manual — Page B–82Printed: “7.8—11 N·m (80—110 cm-kg, 69—95 in-lb)”
  • 1994 Mazda MX-5 Miata Workshop Manual — Page B–82Printed: “7.9–10.7 N·m (80–110 kgf·cm, 70–95.4 in·lbf)”
  • 1999 Mazda MX-5 Miata Workshop Manual — Page 01–15–2Printed: “7.9–10.7 N·m {80–110 kgf·cm, 69.5–95.4 in·lbf}”
  • 1999 Mazda MX-5 Miata Workshop Manual — Page 01–15–3Printed: “7.9–10.7 N·m {80–110 kgf·cm, 69.5–95.4 in·lbf}”
Exhaust manifold to head nuts (NB2)
NB 2001–2005 (BP-Z3)
Factory manual29–33 ft·lb39–46 N·m39–46 N·m29–33 ft·lb
Notes
Replace gasket.
  • 2005 Mazda MX-5 Miata Workshop Manual (electronic manual capture) — Page PDF p. 854Printed: “39—46 {3.9—4.7, 29—33} N·m {kgf·m, ft·lbf}”
Exhaust manifold heat shield fasteners (NB2)
NB 2001–2005 (BP-Z3)
Factory manual70–95 in·lbin·lb7.9–10.7 N·m7.9–10.7 N·m70–95 in·lb
  • 2005 Mazda MX-5 Miata Workshop Manual (electronic manual capture) — Page PDF p. 854Printed: “7.9—10.7 {80—110, 69.5—95.4} N·m {kgf·cm, in·lbf}”
Mazdaspeed exhaust manifold to head nuts (NB2)
NB 2004–2005 (BP-Z3-TURBO, 6MT)
Factory manual28–34 ft·lb38.2–46.1 N·m38.2–46.1 N·m28–34 ft·lb
Notes
Replace gasket.
  • 2005 Mazda MX-5 Miata Workshop Manual (electronic manual capture) — Page PDF p. 858Printed: “38.2—46.1 {3.90—4.70, 28.2—34.0} N·m {kgf·m, ft·lbf}”
Mazdaspeed exhaust manifold heat shield bolts (NB2)
NB 2004–2005 (BP-Z3-TURBO, 6MT)
Factory manual70–95 in·lbin·lb7.8–10.8 N·m7.8–10.8 N·m70–95 in·lb
  • 2005 Mazda MX-5 Miata Workshop Manual (electronic manual capture) — Page PDF p. 858Printed: “7.8—10.8 {80—110, 70—95} N·m {kgf·cm, in·lbf}”

2. Pipe connection

Front pipe flange nuts
NB 1999–2000 (BP-4W)
Factory manual32–44 ft·lb43–60 N·m43–60 N·m32–44 ft·lb
  • 1999 Mazda MX-5 Miata Workshop Manual — Page 05–11–4Printed: “43–60 {4.3–6.2, 32–44}”
  • 1999 Mazda MX-5 Miata Workshop Manual — Page 01–15–2Printed: “43—60 {4.3—6.2, 32—44}”
  • 1999 Mazda MX-5 Miata Workshop Manual — Page 01–15–3Printed: “43—60 {4.3—6.2, 32—44}”
Front exhaust pipe to manifold nuts (NB2)
NB 2001–2005 (BP-Z3)
Factory manual28–38 ft·lb38–51 N·m38–51 N·m28–38 ft·lb
Notes
Replace gasket.
  • 2005 Mazda MX-5 Miata Workshop Manual (electronic manual capture) — Page PDF p. 854Printed: “38—51 {3.8—5.3, 28—38} N·m {kgf·m, ft·lbf}”

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