There are lots of clips on youtube that give you an idea of what various configurations of fast intentions sound like
I have the resonated high flow cat and 18-inch resonated exhaust.
it is barely louder than stock under around 3000 rpm. After that you can rip it and hear the thing scream. This suits me because I drive the car on the street and don't need that much attention
If your situation is different you can get non resonated options, or if you want to spend the money, go with their long-tube headers and exhaust combo which eliminates the cat and will give you plenty of sound
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