I made my own baffles out of masonite to fit 4 3.5" drivers (don't remember the brand off hand) in the same way as the stock kit. It was a great improvement in sound quality and sound stage. total cost was around $100 for the 2 pairs of speakers and materials. I saved the pattern I made for the baffles somewhere. If I can find it, I could scan it and upload it here if anybody else wants to DIY a solution for themselves.
I also replaced the stock door subs with Kicker 6.5" subs using the baffle design floating around here. VAST improvement over stock. I replaced the stock 4x40 amp with a pair of small-footprint MTX amps and I can't say enough good about them. I got the two amps to mount on the stock amp bracket in the frunk. The sub amp is a 1X500 class D (RMS at 2 ohms) while the main amp is 4x75 class AB.
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