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Old 12-22-2011, 12:27 AM   #54
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Join Date: Jun 2010
Location: Calgary, Canada
Posts: 3,882
My Ride: 900rwhp Turbo M3
Originally Posted by 02black330ci View Post
Its because the turbo uses a divided T4 exhaust housing, so you need two wastegates to regulate boost pressure on both sides. Our turbos do not use a divided exhaust housing, hence only one wastegate. If you go back to the previous pictures, you can see where the exhaust manifold shows the divided section.
Makes sense
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