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When sizing a turbo your exhaust manifold back pressure (EMAP) can help give you the data you need in order to know if you are getting all right, or all wrong. While it’s not a common input in most street cars, turbine inlet pressure (TIP) or exhaust manifold pressure (EMAP) is a useful input when it comes to analysing your turbo sizing and performance in high end race engines. It’s not uncommon with factory turbocharged engines to find that the EMAP is double the boost pressure seen in the inta