remove the throttle body, but not the intake manifold.
you can then get on it from the bottom with a deep socket.
I just did mine last weekend and it was on there good.
I think there is some type of thread lock on it.
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2005 Legacy GT
2002 WRX VF22, Pinks, big TMIC and turbo back 128,*** miles
My WRX's Cardomain Page
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