It all depends which exhaust you have. For example a vortex or blitz are louder than a prodrive etc. It also depends of you still have cat(s) in place and a resonated section.
If you want more noise firstly remove resonated section (pipe that meets the back box) and replace it with a straight through pipe and see what you think. If it's still not loud enough then remove the second cat, though it would be wise to get the map checked, and for even more noise and a performance gain, then remove the cat in the downpipe. If you do this then you'll definitely need a remap.
As an example a full decat with a Hayward and Scott system sounds really nice, but a full decat with a blitz will make your ears bleed! Depends what you want.
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10 Years of Scoobies:04 WRX SL, 06 HAWK STI, 97 JDM WRX STI WAGON, 05 WRX STI, MK3 FOCUS RS, now Porsche Cayman S
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