Save up and go for full exhaust with headers man else don't bother with catback, for the price you pay only 1 or 2 hp gain or you could loose power. Also you need other supporting engine mods too for bit more power gain, even that you wouldn't be able to tell the difference in power gain. Engine mods aren't cheap either.
It'd be better off spending on improving braking/handling with base models.
If you want power then save up buy type r or s or even dc2r.
If you have time read timmy_b base dc5 build thread there are heaps of great info there
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