I just installed my injen short ram and it is great. Fairly easy installation(I got stumped for awhile because of all the vacuum hoses, until I figured out that you take them all out and plug the nozzle in the engine block, after that the rest was a breeze). The soud is awsome, especially in combination with my TRD exhaust. I do notice that the intake vibrates a bit, is it normal, or do I have to tighten something better? Anyway, I didn't get Check Engine or anything. I'm very proud with it.