[Update] 2/12/20: Installed a TRD Cold Air Intake
Ordered the 6 parts to save some money instead of full TRD Cold Air Kit to save some money and so that I could use a different filter. I didn't want to use the TRD pre-oiled filter that came in the kit because I was paranoid about getting the MAF sensor dirty.
Instead, I'm using an AFE Pro Dry S Air Filter.
Here's the 6 parts that I ordered and I found the
How-To-Guide (CAI) extremely useful
(TRD Air Filter Lid Replacement w/clips) TRD INTK FLTE LIDR PTR03-35090-AA
(TRD Lower Air Box Replacement w/clips) TRD INTK LWDAIRBXREP PTR03-35090-AF
(TRD Replacement Intake Flow Accelerator for CAI) TRD INTK FLW ACC PTR03-35090-AC
(TRD Replacement Intake Air Tube for CAI) TRD INK AIR TUBE RPL PTR03-89100-AA
(TRD REPLACEMENT coupler & clamp hardware kit for CAI) TRD INTK HRDWRE REP PTR03-89100-AB
(TRD, Air Flow Monitor, Cold Air Int) TRD GAGE INT TUN PTR03-34071
Performance:
I notice better response and accellerating, especially when coming from a stop or needing to get up to freeway speeds or passing someone.
Sound:
IMHO, it's not any louder during regular driving and it opens up when you get on the gas / WOT. Nothing obnoxious though, it's a perfect match with the TRD exhaust.
[edit update]: Had to accelerate hard/WOT when I wa merging onto the freeway a few days ago and oh my, what a surprise! The 4R roared like I never heard. My wife and kids were actually surprised and were like, what's that sound? Is everything ok? lol. Pretty much startled them.
MPGs:
I only drove on the freeway for 2 miles so far, so nothing to report there. But I've driven about 60 miles the past few days (almost all city - to and from work) and I'm getting 17 mpgs. Before I was in the 15's.