Welcome to the forum,
Congrats on the Daytona.....really a great looking truck!
If it has the Infinity Sound System, there should be a small badge on the door near the base of the window, where the door meets the A pillar, that has 'Infinity' written on it. If you are satisfied with the sound of it....why change it? I will admit that upgrading it can improve the sound, but upgrading the engine can make it go faster too.....but if your happy with how fast it is......
This forum is full of great looking trucks; packed with great mod ideas and there are loads of knowledgeable and experienced people here.
AND - We all like pix! Thanks for sharing yours. You have a great looking truck....a real gem!
Enjoy the Z!