CAR PROBLEMS - Ford 2002 Mustang - Auto?

My car seems to have an issue that s causing me concern. I noticed whenever I start it, it sounds a bit awkward immediately before it starts up. In addition to this, when accelerating, it seems like it's struggling to accelerate (holds at 2000 RPM). (Possibly extraneous) It also almost overheats nearly everyday. To combat this, I fill it with water every morning. It hasn't been overheating recently presumably since I've been resupplying the water. I d like an identification of the epicenter of th(ese/is) issue, thank you!

Which is the better car 2015 Subaru wrx or 2015 ford Mustang 5.0?

OK so I drive a 2006 ford Mustang gt. I've had my car for about 2 years and it's been a good somewhat reliable car. But I feel like it's time for an upgrade I currently work for Subaru and since I get a discount would like to get a wrx. But I like a wrx and mustang it's a tough decision on what to get. Can someone give me major differences between the 2015/16 wrx vs the 2015 gt 5.0. It's going to be my new daily driver. Probably only take it out to the drag strip once. Also if I do get a wrx what are websites I can find aftermarket parts for it.

Which car should I get: Mustang vs Charger?

I have a choice between 2 cars, price isn't an issue…

Car 1: 2008 Ford Mustang 4.0 V6
Manual
55, XXX miles
Ford Racing performance/appearance package

Car 2: 2007 Dodge Charger 3.5 V6
Automatic
57, XXX miles
No additional add-ons

I'm purchasing at the end of the month (March 2016) so I would like some opinions by then.

Can I drive someone else's car if I don't have insurance on that car?

I drive a Honda Accord and have just minimum liability on it.

My brother drives a ford Mustang and he also has just minimum liability…

We're paying for our own car insurance but what if I drive his mustang and crash it will my insurance cover the costs or do I need to be added onto my brother insurance policy for the Mustang to be able to drive it?

Or just by having insurance I'm protected by driving any car?

I mean just for the other person car I crash not the damages to my own car I'm driving.

Is this Mustang worth $5500 dollars?

I found this 1999 Ford Mustang V6 with 160,000 miles. The owner said that it is in great condition. He has have the car for the entire life of the car. But I don't think it's still worth $5500. He also said that the price is firm what should I do?

Where or who should I go to get duel exhaust on my car?

My car is a 2005 Ford Mustang v6 and I want to install duel exhaust on it and once I have enough money I'm going to buy a duel exhaust system from AmericanMustle.com and I would rather have professionals install it and how much would they charge me for install? So I need a little help here once I buy the duel exhaust system thanks