So I'm thinking of upgrading my P5's stock audio system. Here's what I want to do. I want to replace the stock speakers with a nice full range set (front only - rears can stay the same). I really need the space in the hatch for my equipment, so a sub back there isn't an option - no spare tire subs either. That leaves me with few options in the sub dept. I'm considering the Clarion SRV303, which is a compact sub that will fit under the front seat and includes speaker level inputs to use in conjunction with a stock HU. I would like to keep the factory HU just as a theft deterent. If after installing these speaker upgrades I'm still unhappy then I'll consider upgrading the head unit. And if I'm still unhappy after that I'll consider external amps. But I want to keep this simple. Anyone on here use the Clarion sub or have heard it? I'm curious to know if it does as good a job as the stock spare tire sub. I currently have no sub at all, so anything will probably be an improvement. Any suggestions on the full range speakers for the front (considering I'll be using them with the stock HU - at least initially)? Anyone happen to know the signal to noise ratio on the stock CD player? Thanks for any suggestions and/or info.