I Just Purchased a 04' GTV6 SE I have a few questions
 

I am new to this forum and I just purchased a 2004 Tiburon GT V6 SE and I have a few questions.

1. I've heard mixed responces to replacing the stock infinity head unit. Will the stock 8" sub work with a new aftermarket head unit. If so which head unit would you recommend.

2. My tibby seems a little slow off the line. It is a automatic which I know will be a little slower then a manual, but I was wondering if anyone has the same issue, and if a performance chip would help.

3. It came is a "grounding kit" attached to the negitive battery terminal. What is this for and is it useful at all?

Thanks in advance for your help. I will post a photo soon.