If you think that replacing your stock speakers (non-JBL) won't make a difference, than look at the junk I pulled out of mine! I wish I had a picture of the magnet, it was about 2 ounces and like an inch around! I really cannot believe these speakers actually sounded as good as they did ?
With some ingenuity I made my new infinitys fit, had to tear apart the Toyota tweeter up front to make a bracket for the infinity tweets. The rear speakers I wound up drilling some holes in the metal part of the door to make them work

The first hole is the most painful, each one after that gets easier.
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2007 SR5 4WD V6 Titanium Metallic- Toytec Ultimate lift, 17x8 Pro Comp 7105s, 285/70/17 GY Duratracs, Kenwood-Infinity system, ROLA Roof rack, PlasitDip emblems and more.
http://www.toyota-4runner.org/4th-ge...ld-thread.html
2005 Limited 2WD V8 Black-Stock