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The TVIS is supposed to open a set of butterflies at about 4350 RPM to allow better breathing. Below 4350 only 4 of the 8 runners from the intake are allowed flow, if it sounds like a turbo opening at that RPM then it's probably working as it should.
Toyota in their ?infinite? wisdom decided that the air should enter the car in the rear of the cooling fan inlet behind the passenger door and progress behind the trunk, across the back of the car and into the air filter housing you found on the drivers side of the trunk before it gets into the engine bay and the intake manifold. Long and restrictive.
It's a fun car in stock form, learn to drive it as it is. Fix the little things, change the fluids. Download the Big Green Book, (BGB - the shop manual) it will explain procedures with pictures. Get a good torque wrench and torque everything to specification. In time when you are comfortable - bored with the performance we can help you take it to any level your heart and budget will allow.
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