12V in a Nissan Titan

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Are you saying you run the 1/4 mile in 2WD or your truck is 2WD?

 

my truck is 2wd, but its lifted 8in with 38.5 mudders so its ok

 

maybe your gt tunner is off because of the tires i dont think there are even many diesels with 38s that can run 13s and your trap speed would be higher on a 13 second run more like 120mph or so but any way the 5.9 titan every one says to check out is in this section somewhere and its realy sick but if i was you id take the stacks off until you have a diesel they are only cool if they roal coal definatly not cool in a rice grinder gas truck sorry

 

why would trap speed be 120 with a 13 second run? You usually dont see 120mph on an auto truck until mid 11's or so