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Hi all, I'm well aware that this has been discussed before at some length and the consensus is that there is no physical difference between the Euro Spec 124 engine and the Abarth one. However, do we absolutely know that this is true in Euro spec?

The reason I ask is that I have come across an ECU flash tune that offers different maps for 124 Fiats to that of 124 Abarths, which makes no sense if the difference is only in the ECU. I'm aware that the US spec Abarths and Fiats are confirmed as identical, however, it does make me a little nervous to apply a tune designed for a US spec Fiat or a Euro Abarth to my Euro spec Fiat if there is some physical difference, however small.
 
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