Personally, I have tried out the INJEN and AFE intake on the BRZ / FRS. Both does have pretty good high rpm power gains which you can feel it but when it comes to
ON/OFF throttle response, I think stock air box performs much better. With the stock intake or with a panel filter, the acceleration improves at lower rpm especially 1-4k range but you won't have the pull like the after market intakes.
The first time I saw the TRD intake on the Scion celebrity race car, that design really get my attention. Bigger air box increasing intake volume, this intake will improve throttle response and power. I don't think it will make as much power as a aftermarket box up cone filter, however, throttle response SHOULD be unbeatable.
Since no one has dyno the TRD intake, it's too early to judge if it's good or bad. So I will be dynoing this unit and plus a DRIFT OFFICE tune along with it.
Here's are some pics for the intake :
I will keep you update how the install and dyno goes.
Thanks
Ben