I am looking at buying a one owner 2002 Altima SL that was only driven about 7,000 miles a year. I was wanting a 3.5 SE but this car is in such great shape at a good price that it's hard to pass up. I have a few questions about them though:

1. I have always driven v6s so I am wondering if I might be disapointed by the 2.5.
2. Are there any notorious problems with this car?
3. How many speakers does the Bose sytem have?
4. What might it cost to do an HID upgrade?
5. Would an exhaust system be worth buying?

Thanks!