3.45 is a waste of money you will be PISSED you didnt get 3.73 at LEAST when you feel the sad little difference that tehy will make.... if you are gonna spend that kind of money get the best you can. if you have an auto you really need 4.10s.... I have 3.73 and all the other mods in my sig and still manage to get 22.5 mph city/highway mix.
__________________ 2003 Cobra Vert (Redfire) #3938 of 5082 @ 05/27/2003
472rwhp/493rwtq -Modification List - Dyno Sheet 2012 Mustang 3.7L M6 (Kona Blue) 2011 Ford Edge Sport (Red Metallic)