I own a 2003 svt cobra rag top and was considering to put on headers, first question is are they worth the money? I have heard that they do not give you too much HP???? Also if they do work what is better shorty's or long tub. I plan on going full x pipe and x pipe back Magnaflow. I also am going to put pulleys, chip, cai, and 150 direct shot of NOS in the future....Any comments will be appreciated!