I've spent lots of time reading this forum the last few days and still have a few points i could do with clarification on please people. Any help appreciated: The scenario: I have a 2003 A4 1.8T Saloon with a Concert II and without Bose. I quite like the original stereo but not alot. I am not a boy racer and don't want to fill the boot or spend too much dosh. I simply want a more powerful clearer sound that i can plug my mp3 player into. I've read lots about the Andymac install. This sounds good and i fancy following similar lines. 1) It seems the first thing i should do is put an 8" sub in the boot. I assume a Stealth Sub is one that fits in discreetly? Is this right and does anyone have a photo of it - preferably in a Saloon? Also an uptodate link maybe to one for sale and a box or do they come as one? 2) To run it i'm going to need an amp right? Assuming my Sony 444 is ok for this it needs a power supply. This will require running the cables through the car. Is this difficult? Messy? Requires taking rear seats out? Drilling through to engine block? 3) A further point is that my amp has the read and white audio leads for its sound input. The sound from the current stereo is through speaker wires and connections. Can i chop an audio lead in half and join it to the existing speaker cables? 4) May have been answered already but does my car have a sub on the rear shelf? Its not a Bose set up. 5) If i replace the head unit is there any preference over what make i should use in relation to connections ie; Blaupaunkt is a straight swap? I know you can get connections for the other stereo's but they seem to be around £40. I don't fancy the £299 DAB stereo mentioned by Andymac as most of the cd head unit stereo's now can be picked up for around £150 with an Aux input for my mp3 player. Don't forget i'm on a stealth budget hoping the missus doesnt notice the cash withdrawals for these new purchases! 6) Is there a speaker in the centre of the front dash? I think i read that it is naff and should be cut. Is that the case? 7) Finally not a question just a proposition of what i plan to do, does this sound ok? Answers to the above may change my plans. I could fit a 8" sub in the boot for the bass with my 4 way amp powering that and the rear shelf speakers. Then a new head unit with 4x45w max could be left to power my door speakers front and rear. How does that sound? Sorry for covering points that have probably been answered a million times before and thanks in advance for any help.