I have all that stuff from Kenny Brown. The tower brace over the motor makes changing CAI's a bizotch so make sure you have what you want before hand. I'm not sure if I want my old Amazon setup back in or not...it seems my Apten is choking me a little, not sure but my car is stiff....NO DOUBT ABOUT THAT!
I could tell as I put the stuff on and it doesn't hop when there's traction...like as long as it's over 65 degrees I'm OK no matter where I spin my tires...track or streets.
So yes it's worth it, I think.