Any offroad pipe should gain you 12-15 whp with proper tune. I am not bashing tuners, but I went through 4-5 different revisions with your tuner and quickly moved on. I have their free tunes for life with some parts I purchased through AM. Picked up 2 tenths and 2 mph with Lund in similiar weather/DA. FYI.
2014 GT Cobra Jet California Special
Auto, Oxford White, comfort pkg.