Hi guys, I'm sorry I haven't been here for a while. My install went fairly smooth-including the dash, you have to remove tha pillar trim on both sides first before removing the dash panel. The whole install is definitely easier if you have a decent set of trim panel removal tools, I found them on Amazon as well as the coaxial speaker set, I bought the other speaker set (the component set) on eBay. I definitely noticed better lows and the highs are like night and day between the original and the new tweeters. My car doesn't have a subwoofer so I unfortunately don't have any info on that. I also found out during my speaker research that the Alpine system has 2 Ohm speakers and these speakers are 4 Ohm so you may not get a very desirable sound from these unless you change your amp. My car only has the base (small screen and no amp) system which has stock 4 Ohm speakers so I'm getting better sound from these Kickers. But I'm still getting a little static in the vocal parts of some songs-especially newer or remastered recordings (CD or iPod) so now I'm guessing is the stereo itself. So it seems that adding new speakers to my car helps but, with my radio-it's just like polishing a turd. I miss the days and the cars where you can also swap in a new stereo for the ultimate upgrade. I hope this helps.