i have doing some research on new a intake for my GXP and i can't make up my mind on what i want. i talking to other ls4 owners and they say that CAI's take away torque and you will gain HP, but others say that ram air adds torque but takes away HP .so i don't know what to believe, please help me out guys??

p.s.
is there any good Ram air intake's out there? i can buy and who make them?