Thanks, I had started to do the "Biggest Bang Stereo Mod" and I had already bought the caps to do this when my unit arrived for my XFire. I did the HU install and was litterally blown away by how much diff. the HU made that I didn't do the speaker mods for almost a year. Then I did the speaker mod and the subs now work like they were intended to do. I'm just sorry I didn't do the speaker mods at the same time I put in the HU. I had already done the mod on the Roadster, so now DC'Xfire's sounds as good as mine does. These are awesome systems with a little tweeking, no need to replace anything as far as speakers or the amp is concerned (unless you're into compitition decibles).