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Racing Beat Header for 99-00 Miata


Price: $454.00
Item Number: RB-56007
Manufacturer: Racing Beat

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Exhaust Header
1999-2000 Miata
Miata Header for 99-00 Miata *

Racing Beat Miata Headers for the 1999-2000 Miata (manual transmission only) are the result of exhaustive research and engineering efforts, utilizing both chassis dynamometer and road testing. Racing Beat Miata headers incorporate a tuned 4-to-1 design configuration to optimize exhaust gas scavenging characteristics and power output, while improving both the exhaust note and retaining the factory catalytic converter. Hundreds of development hours and over 200 on-chassis dyno runs were undertaken in the refinement of their Miata headers. The Racing Beat Miata header has been design-tuned to provide measurable horsepower and torque improvements throughout he entire RPM range.

Racing Beat NA Miata
Manufactured entirely from 304-stainless steel for superior durability, this 4:1 Miata header will offer years of enthusiastic performance driving. Racing Beat's exclusive cast stainless steel engine-to-header flange features specially designed exhaust ports which transition smoothly to the primary tubing. For the 1.8 liter Miata engine our header utilizes large diameter 1.7" OD tubing for the primary tubing, and then collects into 2.375" OD secondary tubing. All emissions control devices are retained. Each Miata header kit comes complete with installation instructions and replacement rear gasket. If needed, an Exhaust manifold gasket (header-to-engine) can be ordered separately. Racing Beat Header 1




Header Development

During the summer of 2002 Racing Beat undertook a significant project to upgrade the Racing Beat Miata header line. The scope of the project was to produce a 4-1 (four-into-one) type header for both the 1.6 & 1.8 liter Miatas and compare them against the power characteristics of our then current 4-2-1 (Tri-Y) type headers. These new prototype headers featured a new engine-to-header flange, collector, and outlet flange. They also took the opportunity to change construction materials from mild-steel to 304-stainless steel.


With the new 4:1 header project, Racing Beat's initial performance objective was to retain the mid-range performance (3,000-5,000 RPM) of the then current 4-2-1 (Tri-Y) header, and improve the top-end performance (5,000-7,000 RPM) normally associated with the 4:1 type header. Under the guidance of Jim Mederer, Racing Beat's co-founder and chief engineer, initial testing on this project took place almost entirely on the chassis dyno. A rather strange looking test header was configured that allowed them to actually change the primary and/or secondary lengths while the car was strapped to the dyno. This entire assembly was suspended over the car by a specially built frame.





Racing Beat Header 3
Racing Beat Header 1





Over 200 on-chassis dyno runs allowed Racing Beat to determine the optimum tubing diameters and lengths for both the primary and secondary tubes. They also took the opportunity to experiment with various engine-to-header flange porting configurations and collector designs. This development allowed Racing Beat to fine-tune the performance of this new header to achieve the performance requirements.

After repeated test sessions, they finally found the optimal combination that allowed them to achieve their target goal. The test results showed that the top end power of our 4:1 header had improved and the mid-range power was retained. Click here to view an article on the development of our Miata headers and dyno results.

Once the cast stainless steel engine-to-header flange the flange was completed, the prototype was assembled and the 1990 Miata headed back out to the chassis dyno for final confirmation testing. Click here to view the dyno results for the 1600cc header.

NOTE: Header shown is for the 2001-05 Miata. Review the following Miata Header Identification Chart for the specific differences between the various Miata header configurations.

Racing Beat Header 4




1999-2000 California Emissions Equipped Miata

Although this header can be installed on a 1999-2000 California Emissions Equipped Model (CEEM) Miata, it requires the removal of the primary catalytic converter.  (Several states besides California sold these also sold CEEM versions, to determine if your car is equipped with California emission control devices, refer to the emissions decal on the underside of the hood.) The secondary catalytic converter located in the mid-chassis connecting pipe section is retained.
Once a header is installed on a CEEM, the vehicle is no longer considered emissions legal and cannot legally be used upon a public highway. If the header is to be used on for a race application, our Race Header Kit can be used to retain the use of emissions control system. The objective of this kit is to relocate the secondary oxygen sensor to a new position in the exhaust system directly behind the remaining catalytic converter. In order to accomplish this task, the factory connecting pipe must be removed from the vehicle and an oxygen sensor nut position must be drilled and a retaining fitting welded in place.

Our Race Header  Kit includes two (2) wiring harness extensions (equipped with factory OEM style connector plugs), which eliminate the need to "cut and splice" the factory wiring harness. High temperature-coated 18-gauge wire is utilized to provide superior heat protection. Also supplied is an oxygen sensor mounting fitting and detailed instructions.

* Legal in California only for racing vehicles, which may never be used upon a highway.

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