make my mustang louder

I just got a 1999 mustang V6. I put a dynomax muffler under it. But the machanic said, if I want the full sound and HP, I should get a cold air intake system for it. I've heard that this screws up the air/fuel ratio, and I should get a remote optimizer. I dont want to do an H pipe or anything ilegal. I just want a nice cheap way to boost the noise. What would you recommend to the teenager who just wants that rough "fast and furious" sound but doesn't want to spend a lot of money?