a lot depends on the year of the car, if a MEMS1.9 than a decent enclosed induction kit or the air box from a later TF160 with cold air feed will make a good difference, along with a freer flowing exhaust.
If a later MEMS3 car you could have a remapped ecu sent out by Kmaps which will liven it up a bit.
To get big gains though costs quite a bit on the k series so could be worth getting the vvc (143bhp) or ideally the 160vvc trophy as a starting point, after that the options become turbos and engine transplants
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