South african sirion 1.3i

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Hi guyz i'm new, i'm from south africa, i hav a 2005 sirion 1.3i, the 1 with the k3-ve2 engine and the steer shift function. Here in SA its rated at 75kw(100bhp). Ther are alot of them here. Its realy quick n a real bang 4 buck car, its given me great service over the yrz. But i want 2 find out what modifications i can do 2 mak it faster. Bare in mind, I want 2 do something that will give me reliable power and cheap, i'm a student?