MX-5 Miata Racing Beat Header. Manufactured entirely from 304-stainless steel to provide both outstanding durability and appearance, the Racing Beat 4-to-1 configured header is sure to offer the MX-5 owner many years of performance driving. Racing Beat's exclusive, cast stainless-steel engine-to-header flange features specially designed exhaust ports that transition smoothly to the primary tubing. Large diameter 1.7" OD tubing has been used for the primary tubing, collecting into a specially configured collector assembly. Exhaust gas exits the header through an OEM stainless-steel rear flange, mating to the factory connecting pipe section. Developed in-house by Racing Beat, this header underwent several on-chassis dyno test tuning sessions to determine specific tubing lengths, collector configurations, and optimum tubing position. Emissions The installation of a header on a federal or California emissions equipped MX-5 requires the removal of the primary catalytic converter unit. However, the secondary catalytic converter incorporated into the mid-pipe section (aft of the header section) is retained. Both primary and secondary oxygen sensors are retained and are relocated into the header outlet collector. (Although this configuration will not affect engine performance, it is possible that this configuration will illuminate the check engine light on the vehicle....to lower the risk of that check engine light use our RoadsterSport midpipe and extend the wires for the O2 sensor and locate them before and after the catalytic converter in the midpipe). Again, because installation of the header requires removal of the first converter, this header can NEVER be CARB legal and is legal for off highway race use only. Each header kit comes complete with detailed installation instructions and a plug-in OEM style electrical extension wire for the relocation of the secondary oxygen sensor to the lower position in the header. The stock engine-to-header gasket can be reused if there are no visible signs of distress or wear. (Mazda utilizes a heavy duty metal gasket which we have found can be reused several times.)
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