Raced a couple cars today at the same time. One is my friends 04 g35 that he just bought last week, and another one that was an s2000 that we just passed and he decided to follow. Heres what went down.

me vs. G35 from 40mph roll
win

me vs g35 vs s2000 from 55mph roll
win against g35, even/slight behind s2000

me vs g35 from a stop.
loss

The s2000 guy said all he had was exhaust, i believe that too.
My friends g35 (yes its an automatic before you ask) has headers, intake and exhaust. Along with some 19 inch rims with 295-30zr19 pirrerli pzero's. His car also has been retuned.

He took his car to the track on friday night and the best times we got were 15.23 and 15.24 (one with and one without traction control or ASC on).

 

Here is a picture of the other 2.