I just finished this tonight myself. Suburu speakers and the Kicker suggestions in the thread above etc. It definitely sounds much better. I think if you are on a budget, you might try the tweeters first and see how you like it. Someone on one of these threads said "you have to crank it up to wake up these speakers without an amp". I say the same. Don't get me wrong much, much better than stock. The clarity and "crispness" is excellent in comparison. Looking back, I think I should have spent a bit of extra money for speakers with higher sensitivity. My opinion is you need to turn up the volume above 35 to get it sounding good and above 40 it sounds
really good. Low volumes sound better than stock but it needs a bit more power to sound as clear as the higher volume setting. I am thinking a higher sensitivity speaker would have been the perfect answer. Maybe someone with more sound system knowledge and comment on this idea.
Here are some lessons I learned:
1. The Metra speaker adapters for the front 6x9s needed an extra hole drilled for the Kicker. No way to line up all four holes without doing so. A little PITA to mount them on the adapters but it will work with some fiddling.
2. Be careful with the green plastic speaker things in the doors. You can crack or damage them if you don't go in straight with the screws. Essentially they behave like they are stripped. My own carelessness there. A quick solution I used was to fill them up with thin tooth picks. The ends won't allow the toothpicks to push out and the screws seemed to bit into them pretty well.
3. Be careful with the bolt cover on the pillar covers. I was a bit rough with one and broke a tab. It will be easy to replace of course, but annoying when you have a missing cover in the interior of your new truck.
4. Driver side tweeter connector... might want to enlist someone with small hands to get that connector off. No way I could fit my paws in there. I had to ask the wife to do it.
5. Don't need to force any connector. If you release it proper, it slides out super easy.
6. In the rear doors, I poked a hole in the rubber grommet in the door to run the wire adapter into the door. Seemed to work well... probably better test raising and lowering the window though.. I did confirm with Crutchfield this was the right thing but forgot test the rear windows tonight.
6. Crutchfield wire adapters needed a tiny bit of loosening with the connector to slip on. I was beginning to worry I was gong to snap the connector tabs off the speakers themselves pushing them on. But a little pry with a jeweler screwdriver did the trick. Might not be an issue on other speaks or with other wire adapters.
7. Don't be afraid of the door panels. It was pretty easy. You need some force to pull and it sounds terrible. Don't have a heart attack. It all goes well.
Overall really happy with the result. Thanks so much to the original poster for this tip on the tweeters and research into this. I am very glad I didn't spring for the JBL upgrade. This is really good for far less money.