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Old 12-22-2011, 12:27 AM   #54
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Join Date: Jun 2010
Location: Socal
Posts: 4,024
My Ride: 1000rwhp 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
1000+RWHP, Lab22 Built Turbo S54 - BMW Half Mile Record Holder
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