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Looks that all of the current tunes are based on the original 20050 tune.
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That's because the 20050 tune is the base tune for all the tunes and is the best tune for modification... The 20054 tune is a bastard child of a tune created by some Dr Jeckel and Mr Hyde over at Hinkley!
Seriously, the 20054 tune opens up more power in the first couple of gears but then restricts power in the mid range in the middle gears! I think it was developed purely to stop the decel problems but is the root cause of some of our idle issues etc!!