How much HP does the SC add? I have the k&n (can't tell that much difference) but i also did a Tune & now it'll throw you back in the seat! If i'm rollin' at 20mph in first gear & get down on it, it is Violent ( i could see a SC being really Ruff on the tranny)! Tune is the Absolute Best thing i have done to mine! & he told me that they haven't been able to tell much difference in the MPG though. I was getting 11.5 & now its been getting 11.6-11.7 so not much difference, but i wanted it mainly for the HP & Torque!

 

I'm not sure how much extra horse power mines has but I definatelt gets the whole truck twisting and pulls a lot of weight off the front of the truck and that's w all wheel drive all the time but I don't think the trany' hold up without a better rebuilt trany w upgraded parts

 

It will add at least 120 HP. The 03 and 04 come with 316 HP, 05 to 07 325HP, 08 and 09 393 HP.