TRD air filter
I have the TRD intake filter and it seems pretty good. You should probably know that if it is from TRD then there has been researched put into the design and manufacturing of its products. What I also did was I removed the second air filter located on the inner side of the air intake cover. It is platic rivited in, so just get a screw driver and pry it out, once out, you can never put it back in!. I also took my dremel and cut out the lower air intake tubing of the bottom air box. I feel this lets an even flow of air to come in. Why did I do this, If you look at a used air filter and notice the dirt pattern on it, only half of the filter will be dirty, the dirty part is only after the exit of the bottom air box tubing. So I figured that If i removed this tubing then I should get an even, overall, better airflow to all points of the filter intake.