How can I make my XP louder?

[Work2Ride]

Rumble Pack
[media]http://www.youtube.com/watch?v=asX0pEHGO7E[/media]

Jaws
[media]http://www.youtube.com/watch?v=B-RvVVu1oUo[/media]

Specialty Sleds
[media]http://www.youtube.com/watch?v=qyVzM11ZEzU[/media]

BMP
[media]http://www.youtube.com/watch?v=EwaDjKlpWQc[/media]

Dynoport
[media]http://www.youtube.com/watch?v=G-8eUZEV7ws[/media]