minor things worth replacing/ buying in a dc5r?

[Nepolian]

1. Dc5r stock head unit?? it looks so plain n low on features (e.g. Ipod dock, eq,etc) replacing it with alpine/pioneer Head Unit only would improve the sound or anything at all? Even if its still with the standard speakers/tweeters?

2. Muffler?? since im a cheapo, cant afford/dont want to buy the whole exhaust system (as mentioned i want minor ug @ limited budget), i only want the muffler for better wow factor/sound/rice...is it worth it??

3. HID?? 6000K..I dunno why but it just looks better with hids...is it worth??
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1) Aftermarket h/u would still improve sound quality, even with stock speakers.

2) Why not, will sound better and improve performance a lttle.

3) Go for it, everyone else does!