I have run my 2003 STi on all three - Ultimate, Momentum & V-Power.
Ultimate was my bad, used to run my Turbo 2000 on it and it was OK. Didn't realise the new car wanted 98 minimum. Anyway it ran like a bag of ****.
Momentum I tried and liked, not much difference what-so-ever (to my less than knowledgable self anyways) the only reason I use V-Power is that Tesco is further away.
Edit: My car is standard, apart from panel filter, 2nd de-cat.
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