Just got my new 2001 F-150 SuperCrew. It has the so-called "premium sound". I wanted to know if the HU (Kenwood 6011) I had in my '97 F-150 would work in the new truck. Same wiring harness, etc. Is there a separate amp behind the HU that I can continue to use on the Kenwood? I would like to add two speakers to the front. I had the Infinity Reference Series 5712cf in the '97 F-150. Should I use these again or try something different. I am intrigued by the components (adding the tweeter). Is there a way to install tweeters w/o having to do any cutting? Would like to do the above myself. Can't figure out how to take the door panels off for speaker installation. Is it similiar to the 2000 F-150?
Also, what the hell is "premium sound". Doesn't sound any better than the factory HU and speakers I had in my '97 F-150.

I would appreciate any help.

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2001 F-150 SuperCrew XLT 4x2
Oxford White