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YOUR CAR WILL BE MORE RESPONSIVE WITH 98 RON PETROL, BUT THE ACTUAL POWER DIFFERENCE IS DEBATABLE, HERES SOME INFO THAT MIGHT HELP
http://www.thorneymotorsport.co.uk/tuning/Fuel_Test_Results.shtml
sports cat is unlikely to pass an MOT anyway, mine failed with a 200 cell cat.
exhaust will sound better and offer a little power with interchangeable decat option!
it's a small turbo conversion, I think the reason K-tec have specified 7psi boost pressure is because with any more the valve overlap would cause backflow into the cylinders