1st off, Going to order a bunch of new sound system stuff for my truck, and they are asking me if I have the Infinity sound system or not, How do I know if I have that or not? Is there like a decal on the radio or something?

2nd off, Those 2 big speakers in the front doors, are those like a stock subwoofer?

That's it for now I think. Thanks

Infinity system gives you tweeters in the a-pillar. As far as the front door speakers, the are just basic 6x9's.

If you have the infinity system, then you will want to do some searching. The front door speakers will have a built in amp and this complicates things a little.

If you have the standard system, everything should swap out pretty easily.