I would like to here from the people who actually have the Circle D 3C converter in their 2011-14 GT naturally aspirated automatics. How much did it help your 60 ft. and 1/4 mile times? And, how much did it change your off track drivability? I am ready to do this and I want to be sure I get the correct converter for my driving needs. Thanks for your help.
I can't answer for the Mustang GT...........or the Circle D converters.......but about converters in general they usually knock about .2 off the 60' times, when used with drag radials. I'm guessing knocking off about .3-.4 off the quarter mile times, however on both cars I had them on, I had them installed with long tube headers and a tune at the same time, so it's hard to actually compare apples against apples.
I had a 2005 GTO with a Vigilante converter and Nitto NT555R drag radials and a 2009 G8 GXP with a Yank converter and Nitto NT05R drag radials.........both cars reacted the same way with the converters. Both converters were 3200 versions.
About daily driving, I really didn't feel much difference, however the gas mileage (HA!) dropped about 2 mpg. Fortunately I buy cars where I could care less about gas mileage.
I'm heavily considering a 3200 converter and long tubes in a year or so.
The one thing the my Pontiacs had that the Mustang is different is that the cost for the Vigilante and Yank was around $750-$800 and it seems the converters for the Mustang GT are several hundred dollars more. I'm not sure about how stout the Vig and Yank were, I'm not sure the number of disc's, etc., but I took both cars to the track and ran the quarter mile >100 times after the converter was installed and never had a hint of a problem. You also need a transmission cooler, however I think the Mustang GT comes with one, or that was what I was told by one of my G8 buddies who moved over to a Mustang GT.