Introduction
This header removal is a great write up to show the steps on removing the stock header on a Scion FRS or Subaru BRZ. The stock header is a bit heavier than our catted HKS one. If you are installing a header without a cat, im sure you will notice a big difference in power and the difference in weight as well.
Parts
No parts specified.
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There are various bolts on the back under tray that need to be taken off with a 10mm socket
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There are 11 Bolts that have to be taken off to remove the black under tray.
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After getting the rear under tray off, its time to move on to the front under tray.
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Theres 7 black clips that require a flat head to pop out. Be careful not to break the head on these. Once they pop out, just pull them out of the hole.
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After the Clips are out, go ahead and use the 10mm socket to get the bolts out. There should be (8) 10 mm head bolts holding up the under tray.
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After the removal of the front pipe, you are now ready to move on to the over pipe.
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Remove the nuts securing the overpipe to the header. A 14mm gear wrench is suggested.
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You now have to un-clip the two o2 sensor pig tails. The black and the grey one.
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You also need to disconnect the clip securing the o2 sensor wires to the front of the motor.
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You may now remove the o2 sensor. Be careful not to strip or round the head of the sensor, as it will make it more difficult to remove.
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The completion of the header removal can now lead to the installation of the aftermarket header.
The completion of the header removal can now lead to the installation of the aftermarket header.
One Comment
Before removing the O2 sensors make sure the manifold is completely cold. Not even warm. The threads on the O2 sensors rip off super easy.