I found this old footage on Youtube:

According to the user who placed the video this Corolla Levin AE86 has a 380hp turbo-ed 4AGE. Very impressive, and more impressive they did that 17 years ago!!

You can see the exhaust got a simple turbo manifold and a lot of piping go through the enginebay. The turbo is enormous, so I expect the boost being at least 16psi! Looking at the piping the car probably has an intercooler under the front air dam. And the engine is not a 4AGZE block which currently is a popular basis for turbocharging but a normal bigport (probably second generation) 4AGE: it still has the TVIS.

At first I doubted about the authenticy of this video, but if I look well to both surroundings (and clothing of the people) and other videos this user posted I can conclude that the footage is authentic! Back in those days the only modifications were functional modifications: tower brace, boost gauge, revmeter and that’s it. Other from that the car looks like a stock kouki AE86 which just rolled out of the Toyota factory!