A header on a VX is like plastic surgery on my 99 year old aunt.
In my Insight the 'exhaust manifold" is part of the head casting to help the engine warm up faster. Pretty sure they did the same thing with the latest version of the Prius.
Nothing new there, Ford did it with the old in line sixes a long time ago, although maybe not for the same reasons.
regards
Mech
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