IIRC, a 3.45 was available with the 2.5l. The swap would not be worth your time or money. Changing from 3.27 to 3.45 would add a tiny fraction of improvement for the cost. If you really want a change that you can feel, look into whether the ATS-V 3.73 rear can be swapped.
I went from 3.23 to 3.73 in my LS1 Camaro and there was a performance gain (measured at the track by myself and many others) and a definite SOTP improvements. The only people that switched to 3.42s were those that started with 2.73s. Nobody went 3.23 to 3.42.
I went from 3.23 to 3.73 in my LS1 Camaro and there was a performance gain (measured at the track by myself and many others) and a definite SOTP improvements. The only people that switched to 3.42s were those that started with 2.73s. Nobody went 3.23 to 3.42.
