I too have the stock non-Bose unit. Replaced mine with the infinity reference. Its a huge difference over the stock and relatively easy install. The amp is very low power, so if your staying totally stock go the Kappa's. I'm adding an amp so the infinitys sound will be more to their abilities. The stock amp is only dishing out about 20 watts a channel so the infinity's fall off a bit on mid volume (their 4 ohm), the Kappa's being 2 ohm will give good volume nearly all the way to their max volume. I wanted more crisp driving clarity, so I needed more go juice, the 65 watts per channel MTX amp should help me their. The infinitys are at Circuit City to listen to, the Kappa's here are at a high end stereo place called Sound Advice. Try similar place were your at to hear them. The Kappa's sound very good if your just looking for plug and play. There is an install page here so trust me, you can do it yourself. The tweeters are the toughest to install because the little suckers are difficult to pop out of the post, but doable, and they will also be the best improvement. Good Luck with your choice.
