i wouldn't put a straight through exhaust on a 1.0 as small engines rely on the backpressure for power, sounds strange i know , but there's plenty of help on the forum mate just have a nosey. things like a bigger carb, less restrictive inlet manifold, and replace oil and air filters with performance ones. or go all out and drop a ga16de or SR20. Lots of work involved with the latter but there are some mean machines roling around here (Y)