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Welcome
The Corsa exhaust should be a full catcack (which is a good thing).
A good start for someone into modding (like you seem to be) would be a well selected CAI (cold air intake), Long tube headers, and a tune. On average, that will give you about 40 rwhp or so and make your car noticeably faster (about 1/2 second in the 1/4 mile).
There's a lot of good intakes on the market. Most of them make very similar HP. Jannetty did a couple intake tests you might want to look at.
Long Tube headers - everyone has their favorite. The two most popular brands are ARH (American Racing Headers) and Kooks. I personally like Kooks, but ARH also have a good reputation. There are also several other less popular brands out there that people seem to like.
Tune - I might as well put it out there because others will. When you tune your car you can get into warranty issues if something major happens. Saying that, a tune is recommended when getting a new intake and long tube headers.
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