Re: what are the two silver modules attached to the turbo
The silver canister with a rubber hose attached is the wastegate actuator. This is the device that actually fills with air and opens the wastegate inside the exhaust manifold to control boost. There is also a surge valve bolted directly to the compressor scroll. it has three bolts and has a hose connected to it as well. This allows pressure that backs up against the throttle plate to be vented back into the intake pipe that feeds the turbo inlet.
Brian
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