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I recently purchased an 03 Civic Si...... I am new to all this and was just curious what are some simple ways to make it quicker or add HP (this car is 100% stock at the moment). Cold air intake? Exhaust system? Or whatever other suggestions anyone can make as to what I could do and what brand to choose.

I bought this car just for gas purposes but just wanna add a few things to make it a little quicker.

Thanks

 
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Do u have a Canadian si or US si?

I'm going to assume that you have a US si since your profile says fort worth.

Adding a intake and an exhaust should add some ponies as well as maybe a stage 1 cam