Japanese fuel is usually 100RON - Tesco is 99 so in theory you should be OK to run on High Octane UK Fuels (e.g. Tesco Momentum or Shell Optimax) without a remap but personally I'd want the car mapped to the UK fuels. My car is Mapped to Momentum and runs like a dog if I have to put normal fuel in it in an emergency and I would never run the car on high boost if it had bad fuel in.
On a side note many cars do not get on with the BP Ultimate mine included!
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2005 Spec B 6MT - KiDO tuned (~270Bhp)
Custom exhaust - Cosworth filter - Samco Intake - Tints - Bilstein B8/B6 & STI springs - SuperPro ALK - Whiteline positive shift kit, rack mounts, rear adjustable camber bushes, front ARB mounts & strut brace, 20mm rear ARB with AVO mounts, - Hardrace Gearbox and pitch mounts - Prodrive PFF7's - Front Brembos - Kenwood CarPlay - 1/2 carbon grille - STI front splitter
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