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7192 Views 40 Replies 24 Participants Last post by  alas
I just installed the INJEN CAI last night and all I can say is ... OH MY F*CKING GOD! What a differnce especially in 2nd and 3rd gear in the 4500 to 5500 RPM Range. The sound is incredible. I waited almost a year for the damn AEM that will never come out. I am telling you, this is one of the best bang for the buck MODS available. I paid $230. plus $17.00 shipping and insurance off of Ebay. I got it from California in about 3 days. I decided to have it installed as a short ram after talking to a Toyota master tech and the problems he's seen with installing the full unit up front. He's seen customers who have installed the full unit having engines bogged down with water making the engine stall. I don't need that with the rain we get in Chicago. When I take my ride to Black Hawk Farms Raceway, I'll install the full unit.

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To say that there are zero gains from a CAI is pretty false.

There aren't substantial gains from a CAI but there ARE gains.

The OEM intake tract is VERY baffled. There are several resonator boxes connected to the plastic piping - each box will hamper the airflow and decrease noise. That is why with a CAI people will hear a more "agressive" sound. And, the same with the exhaust, when the resonators and bafflings are removed, gains can and will be realized.

The discussion on NASCAR engines with the tiny restrictor plates is 100% true and very valid. What it doesn't cover though, is the uniformity of the intake tract for those engines. The 2AZ has at least two large resonator chambers or boxes connected to the piping as well as that ruffled baffling which all somewhat impede airflow. Also, the most restrictive part of the OEM system (probably where the real gains will show up) is the OEM paper filter. That thing is really thick! Replacing it with a cone filter and providing a proper path for the air will yield at least some power advantage. I don't know how much (if any) gains can be realized from the "cold air" that is supposedly coming through from the wheel well. I would always recommend the GFI over any CAI but a CAI should show some purpose on the dyno.

CAIs can, however, be detrimental, time wise. Some owners have tested CAI equipped tCs with those nifty G Tech toys and found increases in 0-60 times. Some owners, looking to find real world advantages of the CAI, have raced stock tCs and found themselves coming up short a few fractions of a car length. Also, the reverse has been found to be true.

But regardless of real world times in street and track drag races, the gain in power will be there. The question really should be whether or not the power is useable.

My answer? For racing purposes, don't bother. For daily driving and some nice bling in the engine bay, it's totally worth it.
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