Ok so i'm quite a new driver, been driving my micra for the best part of a year and a half (learned in it), passed last december So for my birthday I had new speakers and stereo. But what i'm finding is that I don't think it is loud enough. I have a 3 door 2001 reg, so only two speakers. How much would it cost to make the back shelf with speakers, and maybe a sub? and would it be worth it?? Bear in mind I have quite a limited budget, I'd say around £100 to spend. Thanks in advance for replies.