Are you just trolling now since your profile pic is a Lightning?
Debate as old as time. I think (and testing proves) that they provide some boost to performance, but it's not enough to be noticeable. Depending on the intake type, you'll get some additional engine/turbo noise which is what a lot of folks go for. I personally got it because (1)I like having the reusable filters so I don't have to change them all the time, (2)for the aesthetics, and (3)the increased engine noise. I have a S&B intake which I really like. I was debating between that and the Roush, but S&B got me since it was almost $100 less.
Is it worth it? Not if you're only going for performance from that mod alone. The Stage 1 upgrades from Whipple all include an intake with the larger intercooler and tuner.
No trolling here. The icon image is a image i found on google and thought it was a nice picture to add for the thumbnail. I was looking at the S&B, and think thats the one i am going to go with. Not really into the whole performance thing, i sold my whipped single cab, and now got a 3.5 EB for tons of driving purposes.