Dorman 03404 Exhaust Manifold Stud and Nut

Exhaust Manifold Hardware Replacement

Dorman 03404 is a standard replacement exhaust manifold stud and nut set made to match the fit and function of the original hardware on specific vehicles. It is built for exhaust manifold repair or installation where correct thread engagement and durable metal hardware matter.

Compatible With select Geo Storm, Isuzu Stylus, Isuzu Impulse, Geo Spectrum, Isuzu I-Mark, and Chevrolet Spectrum applications, this hardware supports a direct-fit repair approach for manifold service on these models.

• Standard replacement exhaust manifold stud and nut hardware
• Metal construction for manifold service applications
• Dog point fastener design
• Matches original fit and function on listed vehicles
• Interchange reference: 12337995

Detailed Product Overview

This Dorman exhaust manifold stud and nut kit is engineered for specific import and compact vehicle applications where the original manifold hardware has been removed, damaged, or no longer secures properly. The part number 03404 is intended to restore proper fastening at the exhaust manifold connection using hardware that follows the original design requirements. It is a practical choice for repairs on 1990-1993 Geo Storm, 1991-1993 Isuzu Stylus, 1990-1991 Isuzu Impulse, 1989 Geo Spectrum, 1987-1989 Isuzu I-Mark, and 1987-1988 Chevrolet Spectrum.

Part number 03404 is a direct replacement option for technicians and DIY buyers looking for exhaust manifold stud and nut hardware that aligns with OE-style fitment on the listed vehicles. This part cross-references 12337995 for the same application.

Common Repair Uses

• Replacing stripped or damaged exhaust manifold studs
• Restoring clamping force at the manifold-to-cylinder head connection
• Repairing exhaust leaks caused by worn or missing manifold hardware
• Supporting manifold removal and reinstallation during exhaust service
• Addressing broken fasteners found during engine or exhaust repairs

Installation Notes

Verify vehicle application before installation and compare the original fastener style, thread size, and seating surfaces to the replacement hardware. Clean the manifold and cylinder head mounting surfaces before assembly, and follow the manufacturer’s service procedure and torque specifications for the vehicle being repaired. Because exhaust hardware is exposed to heat cycling, corrosion, and vibration, proper preparation is important for a secure installation.

Quality Assurance

Dorman manufactures this part as a standard replacement component for specific applications, with fit and function matched to the original hardware on the listed vehicles. The metal construction and OE-style design support dependable exhaust manifold service on compatible Geo, Isuzu, and Chevrolet models.