Those are some good questions, however not many people are going to stop and answer your questions becaue you can simply find the answers by using the SEARCH feature at the top of the screen. This forum is full of people who have short fuses, and aren't willing to help out the average "newbie" with basic questions.

But just explore the SEARCH feature, and you will find endless amounts of information these cars, especailly after market parts.

As for your questions.

1. There are lots of "Power adders".....intake, pulleys, exhaust, ECU remap, injectors, many more.

2. I'm not sure, you'll have to look

3. Yes, I'm almost positive they make new injectors for the SRT6, I know for sure they make them for the N/A model.

4. Curb Weight for an SRT6 coupe is 3240 lbs. I am sure you are interested in the SRT6 coupe and not a regular naturally aspirated coupe or convertable

Anyways, hope this is a start for you.