right ecu remapping just optimises the fueling and timing to your exact engines requirements, some also raise the boost a little too.
They also usually remove or turn down egr usuage so make engine run better.
If done by one of the trusted big names REVO, Superchips, etc it will have had a long devlopement period and wont harm the standard components or the clutch ( most diesels weak point)
Its a no brainer for me, best thing ive ever done ( ibiza mk4 fr tdi)
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