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These TGV's sound a lot like the flaps in Mazda3/Speed3 intake manifolds, which more or less act like tiny little "chokes" in the intake manifold. They are really only there for cold start emissions. We take them out for better flow. The NA guys don't see a huge difference but it really helps the Speed3's, much like it seems to for the WRX's. Chock that one up as a downgrade. It seems to me, that if they really did fix the FT86 torque dip of doom, they remodeled the intake manifold with a few tweaks, and tossed in the TGV's as well, but dumbed it down in the marketing literature so it would be more easily understood.
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Yes, that's my car in the avatar. |