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Unfortunately, glass exit pipes (it's not a downtube if it's pointing up...) wouldn't last very long... if the thermal shock didn't break it, it would melt under full load, at least start sagging.
Turbo's can spin up over 100,000 RPM under full boost conditions, and exhaust temperature can reach over 1,000* on the hot side of a cartridge. Oil coolers should not be overlooked in this case!
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Ceramic glass can take 1000˚C and is resistant to thermal shock. I have windows on my kiln that regularly go to 1450˚F with room temp on the other side. They can formulate it to match the coefficient of expansion of the metal you are bonding it to and there are agents that can bond it to metal. No problem!
