^Could be a couple things:

-Different Cats/Test pipes
-Different Cameras, Microphones are different so it wont sound the same in every video!!!
-What other mods are dont to each- Intake, Spacer...make it soune a lil diff.

 

coming from a HKS owner, love it when i first got it and still do 20K miles later.

but the Amuse, is really sick in person, has that high pitch that is not really replicable.

 

Agreed, I've had my HKS for about 1500 miles now and I love it, sounds so mean after 3500 rpm. I got it when the weather was already cold last fall so I haven't even gotten a chance to blast it with the windows down yet, I'm kind of looking forward to that as soon as the weather warms up.

 

look at the sedan exhaust thread.