Maybe I can help this out a bit. I owned a 99 LS1 WS6 Trans Am. I had quite the list of modifictions. Put about 430 to the wheels. Now my boss had just bougth an 03 Cobra put on K&N, cat-back, and shifter. I beat him 3 out of 3, but not by much. His was brand new...like 500 miles or so. He ran very consistent 13.4 at the track (4500 ft elevation) and I ran a 13.2. his was in about 105 degree weather. I sold my T/A b/c I got married. With his chip and pulley, he would smoke it now. He spent far less on modifications. I enjoy forced induction from the factory b/c you can get so much more for so cheap. All of the things I have read and seen...the Cobra is better. I spent so much money on my T/A and w/ just a bit of money you can do so much more with the Cobra. I loved my LS1, ad I think it looked better with the ram air and stuff. The Cobra looks still too much like a regular mustang (a non-car person wouldn't know the difference) but my T/A was quite the attention getter. SO take that for what you will.
