Took my 2011 ECSB 5.0 with the 3.31 open rearend to Redline Raceway last night and ran a best of :
Density altitude according to the NWS was 2800' on that run and if corrected would be:
Weld in Flo-pro muffler
K&N replacement filter
5 Star tuning 89 octane tune
I would recommend these mods to everyone out there. My truck has over 30,000 miles on it already as I use it for a service truck for my business. I usually have over 1000 Lbs of parts and tools in it and still average almost 20 MPG hand calculated!!
Nice thruck, I have the same one with a 3.55 lsd. Did you make changes to the front air dam? That looks higher up than mine, also how did you get it to sit so flat? Mine sits way up in the rear. The window tint is sweet!!