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i used millers and seemed fine havn't used it for a while and me engine runs a little rough without it.. so it gota make a difference when i do use it cos me engine runs smooth...
No *need*, agreed. But still definitely worth doing!! If you want a smoother engine with noticeably more kick. Put a bottle of NF in, you won't look back. Trust me.
i get my nf for £13 a bottle and u can get 6 tanks from it
although ive now been useing 75ml per tank to see if its any faster lol (plus i have a rolling road day coming up 2morow and i dont want it to blow up lol)
Pippyrips, is your WRX a JDM or UK market car? If the former, Super/Optimax plus decent booster is a requirement unless you have a KnockLink installed, or your car has been remapped for UK fuel.
If the latter, octane booster simply isn't necessary for normal usage, the cars are mapped to give optimal performance on 97 RON fuel...