whats up guys, new to this board. Have been researching between all the exhausts and am going to get one of these. Whats the weight difference between these 2 and supposed hp/tq gains. I know injen is supposed to be louder. Any reccomendations are appreciated as well

 

http://www.stillen.com/media_files/a...0000000007.pdf

 

thanks that was a real helpful post. Just a little bit of confusion as to is that the injen ses exhaust and the borla true dual exhaust or the ones that came be4 them?