Here is some more twin-turbo V6 goodness, this time from Cadillac. Yup, that is an air-to-water intercooler for each turbo sitting under the carbon fiber (real or just decorative?) engine cover. With Ford doing well with the Ecoboost V6, GM probably felt the pressure to deliver something similar. Well, every manufacturer is coming out with turbo engines in the 3.0L range.
Also standard is an integrated exhaust manifold in the head which the turbos bolt directly to. The end tanks of the intercoolers are plastic and ribbed for strength to handle the boost. You can see how short the airflow path is with it only being about two feet from the turbo compressor discharge to the intake manifold.
I was caught a bit by surprise with the AWD drivetrain attached to the twin-turbo V6. That driveshaft heading back up to the front runs real close to the transmission case. Cats are located right after the turbos for quick light-off.
This is the new 2.5L turbo 4-cylinder Skyactiv engine in the Mazda CX-9. The engine is designed for loads of low-end torque where soccer moms spend most of their time instead of max power, so I am guessing that is why the air intake snorkel does not need to be that large.
Plastic intake manifolds- they are everywhere!