Wastegates act as a pressure relief component on turbocharged cars. Most factory fitted turbos and even aftermarket turbos have a built-in internal wastegates that relieves boost pressure when it reaches set amount. However, certain larger turbos don't feature internal wastegates which necessitates a need for an aftermarket version to release/divert that pressure. Technical aspects aside, external wastegate setups sound extremely cool, especially when venting to the atmosphere via a naughty screamer pipe...
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