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Ktec do an air filter. Get a custom exhaust proaly the best idea.
Personally I'd sort the suspension out first though it depends what you want out of the car though.
Bets gain £ per hp is a 172 transplant as the bits including brakes supension are only £1.5k + vat but then you've got to fit it.
Best change the oil ever 6k and get an air filter and a decat personally value for money wise.