Exhaust Header · SKU 701807501751
Exhaust Header Fits Mazda RX-7 84-91 1.3L 13B Non-turbo Stainless Steel
A pair of 1.3L 13B non-turbo exhaust headers for the 1984-1991 Mazda RX-7, constructed from stainless steel with mandrel bent tubing and CNC machined flanges. The kit includes studs, nuts, and flange gaskets, with a 2.00 inch inlet and 2.50 inch outlet to increase exhaust flow. Designed for off-road, competition, or racing use only. Not intended for highway use or sale in California.
- MaterialStainless Steel
- Inlet Size2.00 inch
- Outlet Size2.50 inch
- ConstructionCNC machined flanges, TIG and MIG welded
What You Get
Key Benefits
- Mandrel bent tubing maintains consistent bore size for improved exhaust flow and reduced back pressure
- CNC machined flanges ensure a flat sealing surface for reliable gasket sealing under high load
- Stainless steel construction resists corrosion and heat cycling better than mild steel
- 2.00 inch inlet and 2.50 inch outlet increase airflow to deliver up to 13 HP and 11 ft-lb torque gain
- Includes studs, nuts, and metal flange gaskets to simplify installation and reduce leak risk
Why Buyers Switch
Problems It Solves
- Factory headers restrict exhaust flow and limit power output at high RPM
- Mild steel headers rust at the flange and gasket interface after a few seasons
- Poorly machined flanges leak under load, causing noise and performance loss
- Universal headers require cutting and welding, which increases installation time and cost
Where It Is Used
Application Scenarios
- Racing teams upgrading RX-7s for track events with no emissions restrictions
- Performance shops building competition or off-road RX-7s with bolt-on exhaust upgrades
- Distributors stocking vehicle-specific headers for classic rotary engine enthusiasts
- Online sellers needing a high-resolution photographed part with a clear fitment list
Buyers
Who It Is For
- Performance parts distributors buying classic rotary exhaust hardware by the pallet
- Racing workshops that install and tune rotary-powered vehicles
- Classic car restoration shops working on 1984-1991 Mazda RX-7s with non-turbo 13B engines
Construction
Technical Features
- Pair of exhaust headers with 2.00 inch inlet and 2.50 inch outlet
- Mandrel bent stainless steel tubing for consistent bore and smooth flow
- CNC machined flanges with TIG and MIG welded construction for strength and sealing
- Includes studs, nuts, and metal flange gaskets for secure installation
- O2 sensor bung insertion with included metal gasket for sensor mounting
Data
Specifications
| Material | Stainless Steel |
|---|---|
| Inlet Size | 2.00 inch |
| Outlet Size | 2.50 inch |
| Construction | CNC machined flanges, TIG and MIG welded |
| Package | 1x Pair of Headers with Studs, Nuts, and Flange Gaskets |
| Use | Off-road, competition, racing only |
| Exclusion | Not for highway use or sale in California |
Material
Materials
- Stainless steel tubing
- CNC machined flanges
- Studs, nuts, and metal flange gaskets
Manufacturing
How It Is Made
Mandrel bending of tubing to match factory header routing
CNC machining of flanges for flat sealing faces and precise bolt patterns
TIG and MIG welding of flanges to tubing for structural integrity
Pre-assembly check of studs, nuts, and gaskets before packaging
Checks
Quality Control
- Flange sealing face checked for flatness before welding
- Weld seams inspected for pinholes and incomplete fusion
- Gasket and stud fit verified against flange pattern
- Final visual inspection for surface defects and handling marks
Private Label
Customisation Options
- Private label packaging and barcode labels available on request
- Bulk cartons for container orders instead of individual retail boxes
Comparison
Compared With The Alternatives
| Factory Mazda RX-7 header | The stock header restricts flow and limits high-RPM power; this one increases bore size and improves exhaust velocity |
|---|---|
| Mild steel aftermarket header | Mild steel is cheaper but corrodes at flange and gasket joints; stainless steel lasts longer in harsh conditions |
| Universal header kit | Universal headers require cutting and welding; this one bolts on without modification |
Installation
Use Guide
- Confirm the vehicle is a 1984-1991 Mazda RX-7 with the 1.3L 13B non-turbo engine
- Remove the factory headers and clean mating surfaces before installing
- Install new flange gaskets and torque studs and nuts evenly in a crisscross pattern
- Do not reuse old gaskets or studs; use the included hardware for best seal
- This part is for off-road, competition, or racing use only; not legal for highway use
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Answers
Questions About This Part
Will this fit a 1992 Mazda RX-7?
No. The part is designed for 1984-1991 Mazda RX-7 models with the 1.3L 13B non-turbo engine.
What is included in the package?
One pair of exhaust headers, studs, nuts, and metal flange gaskets. No O2 sensor or installation instructions are included.
Is this legal for street use?
No. This product is for off-road, competition, or racing use only and is not intended for highway use or sale in California.
What size are the inlet and outlet?
The inlet is 2.00 inch and the outlet is 2.50 inch. This increases exhaust flow compared to the factory header.
Is the flange already welded on?
Yes. The headers come with CNC machined flanges already TIG and MIG welded to the tubing.
Can we get private label packaging?
Yes. Private label packaging and barcode labels can be arranged. Bulk cartons are available for container orders.
Do I need to buy new gaskets?
Yes. The included metal flange gaskets are for one-time use. Replace them with new ones for each installation.
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