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Old 12-21-2011, 09:59 PM   #53
02black330ci
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Join Date: Mar 2005
Location: ^^ E46FANATICS ^^
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Quote:
Originally Posted by Commanderwiggin View Post
Just curious, two wastegates for better control?
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.
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