Quote:
Originally Posted by GP99GT
o2 housing is a short piece of pipe between the turbo and the downpipe, and it has the o2 sensor in it...probably a factory bottleneck
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Yes, the O2 elbow/housing can be a serious bottleneck on turbo cars. Lots of the Toyota turbo setups have a horrible cast housing that kills flow. It also holds extra heat at the turbo which helps kill them faster. That's one thing about turbo cars, you can do some basic mods to the inlet and outlet areas to help increase/smooth out flow and get some solid power/mpg increases.