bit hard for me to explain by text , so ive added diagrams of the whole engine. Basically the 5th is after the exhaust manifold and just before the turbo , placed there just to increase exhaust temps during burn phase.
the normal 4 injectors squirt in more fuel at the exhaust stroke which does the job normally , but the 5th assists the process
PTP Admin -
the 5th injector is known as an exhaust fuel injector
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