How to make a car louder?

DAVE

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My friend has got an old Holden Gemini and he wants me to make it louder. Will i achieve a louder and deeper rumble with a new Exhaust cannon or do i have to put a new exhaust system in? I have got a 3.5" exhaust cannon. Will welding that on make it louder?
I need the car to be street leagal.
 
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