A carburetor will make just as much HP, maybe even more, you should look into one
The factory ECU can go into much more depth than you realize and give you better driveabillty.
It is your car, handle it how you want.
If this on this list http://www.hptuners.com/products/vcmsuite_vehicles.php, then yes, but why would I want to when I could use MegaSquirt and do everything and then some
amateurish! The car can definitely tell the difference.
It depends on how far removed the instant roll centers (pitch, yaw and roll) the weight is. Obviously weight removed from the washer bottle in the front is much more important than 2 lbs removed from the driver's seat.
If you people can't even get the fundamentals down, why bother