Quote:
Originally Posted by brad850csi
Didn't know there was an updated exhaust manifold. Has it been changed to improve flow?
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The Cyl 5-8 exhaust manifold was revised to accommodate longer actuator arms that fully open the wastegates. The speculation that electronic wastegates were added was incorrect. They've always been and continue to be electro-pneumatic.
There have been a number of updates over the course of S63TU production in addition to those:
- Revised Fuel Supply with inward opening metering valves and CVO (closed valve operation)
- Modified Cylinder Head with Delphi Coil-packs (only in certain markets and build dates; unmodified CH with Bosch Coils is still in production)
- Revised Turbochargers