First of all, good choice on the Mustang GT! I hope you have fun driving it.
1. The K&N should be obvious, it's a red airfilter that is built real solidly.
2. To tell the difference between ram air and a cold air kit is simple. A ram air kit will with have a scoop under the car to pick up air or a "hole" in the hoop to catch the air. A cold air kit will be a solid, fairly straight tube that runs from your fender to the throttle body.
3. The only way I know to tell if you have a chip would be to physically look at the computer. It is under the passenger side kicker panel. Unless you feel confident in taking things apart I would not mess with the computer.
4. You'll have to look under the car for the exhaust. I'm not sure how to tell the brand name, and to be honest I'm not sure what the 4.6 headers look like compared to the 5.0's. But if there are either chrome or power coated they should be after market. If you crawl under the car you should be able to see some Catylitic converters. If not you've got an Off-road pipe. Then there shoule be a section where the 2 pipes come together. It will either look like an "X" or an "H". Then look at the mufflers. They should have a name stamped on them. Hope that makes sense.
5. There is an aftermarket intake for the 4.6 but honestly, I'm not an expert. I know what the stock intake looks like and the SVO intake. Without a digital photo I can't tell the difference. Someone else can (I'm sure)
As for gears I would guess you have 2.73's. 5000 RPM and 110 mph sound like 2.73's to me.
Hope that helps some.
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