Yes the turbo and manifold are one but the 02 housing is separate that part can be enlarged easily for better flow. the CHR can be removed for servicing as well. does that make any sense? sorry that I can't explain it any better.
I never dynoed the car on regular 91 octane but I always mix alittle 100 octane unleaded fuel with 91 octane unleaded the car just runs alot smoother.
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