Got my Injen Cai installed and took it for a test drive. All I can say is WOW! At normal speed there is no difference but when you get on it and take her over 4500 rpms that baby growls as mean as a Raptor about to have a lion for lunch.

I don't know what the difference is in performance but it sure feels like it freed up a few ponies from under the hood. Pain in the ass mod but once it's done it's well worth it.
No hesitation or engine lights. Just a mean ass growl from 4500 on up.
Also it seems the rpms seem to climb a lot faster. Might just be my imagination but my seat of the pants dyno tells me it kicks ass now.