I recently noticed that Mazdaspeed is now selling the SDJ header for the 13B engine. Does anyone have some back-to-back data as to how that header compares with the standard header that has served us so well in the past?

For those that don't know the standard header ends in a flange with two 2" pipes. Many users continue with the dual exhaust to the back of the car, while others will merge the exhaust into a single 3" pipe. What the SDJ header does is to merge the two tubes from the engine before they even get to the flange. Thus the flange has a single 3" opening to mount the rest of the exhaust to.

I am a current owner of an early-style header and would like some input on the newer SDJ style if someone is willing to share.

Thanks.

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Chris Wire
Team Wire Racing
ITS Mazda RX7 #35
[email protected]