Takumi Project Rear Diffuser for WRX STI (VAB) / WRX S4 (VAG)  [Carbon/FRP]

It efficiently covers the lower part of the trunk where the airflow is most turbulent. It generates a certain amount of downforce despite its compact design. It is not easily affected by the shape of the member or muffler, and can be installed with a bolt-on system. We also have a lineup of FRP types with excellent cost performance.

Functional design that efficiently covers key areas of turbulence

The Takumi Project diffuser is a simple one-piece type. It completely covers the lower part of the trunk, which the OEM rear diffuser built into the bumper cannot cover, and provides reliable airflow control.

The material is high-quality carbon (CFRP) that shows off the craftsmanship of the craftsmen. The beauty and texture are so great that it seems a shame to put it on the bottom of the body where it is hard to see.

If you’re wondering about the weight, it’s only 1.945kg. The design keeps weight increase to a minimum.

Fins smooth the flow and the rear end is raised to increase the flow rate.

he plate suppresses turbulence, and the fins streamline the air. The rear end then raises the air flow, increasing the air speed and generating negative pressure to obtain downforce. Takumi Project’s diffusers have been developed with a focus on how to achieve these basic functions as efficiently as possible.

The airflow fins are designed with consideration for ground clearance and interference with car stops, so you don’t have to worry about them affecting the everyday usability of your car.

 

The back side is coated to prevent dust from adhering, preserving its beautiful appearance.

The drawback of carbon diffusers is that dust and dirt easily accumulate on the carbon fibers on the back side (the side facing the vehicle).

Takumi Project’s carbon diffuser has a special coating on this surface to prevent dust from adhering. It is less likely to get dirty, and can be cleaned up quickly when washing the car.

Installation is by bolting on using a special bracket. No drilling required.

Installation can be done quickly using the included special bracket.

Since it uses existing bolt holes, no drilling is required and there is no damage to the car.

The muffler fits many models, including genuine parts. The member side installation is also compatible with most specifications.

*There are some mufflers whose compatibility has not been confirmed and some that require minor modifications.

*Installation on vehicles equipped with AVO center pipe is generally not possible.

*For details on compatibility, please check the <Notes> at the end.

<Notes>

Note 1. If an STI rear under spoiler is installed, it must be removed.

Note 2. Regarding compatibility with rear members other than the standard specifications…

<Confirmed specifications>

– For vehicles equipped with STI flexible support subframe
–> Installation is possible using the included machined aluminum collar and long bolts.

・Vehicles with Cusco power brace rear members
・Vehicles with Rail rear member support bars
→ Can be installed with special machined aluminum collars and long bolts. Please inform us when ordering.

※Link for installing Rail rear member support bar:
https://cartune.me/notes/kolk3YkfxI

・Others are not yet confirmed to be compatible, but if you contact us, we will check and reply to you later.
If you are considering installing a specification other than genuine, STI, Cusco, or Rail, please feel free to contact us.

Note 3. Muffler compatibility…

<Confirmed muffler that can be installed without modification>

・Genuine muffler
・HKS Super Turbo muffler
・STI performance muffler
・STI exhaust kit
・Kakimoto Regu.06 & R Dual center muffler
・Kakimoto Class KR Dual center muffler
・Takumi Project Kyoku full titanium muffler
・Trust Power Extreme R DD
・Trust Power Extreme R HD *Compatibility confirmed in August 2022
・Fujitsubo Authorize RM muffler *Compatibility confirmed in June 2022
・GP Sports EXAS EVO Tune (Exas Evo Tune) left single exhaust (part number 252607) *Compatibility confirmed in November 2022
*Left and right exhaust (part number 252605) is not compatible.
・TOMEI titanium muffler *Compatibility confirmed in February 2023

<Confirmed mufflers that require modification>

・HKS High Power Spec L Muffler
・Extreme Full Titanium Muffler 2-pipe

＜Mufflers that are not compatible＞

・GP Sports EXAS EVO Tune (Exas Evo Tune) left and right exhaust (part number 252605)
*Incompatible as of August 2022

Note 4. Regarding the specifications of the intermediate pipe…

Please note that vehicles equipped with an AVO center pipe cannot be fitted with a muffler without modification, even if the muffler can be installed.

<Confirmed fitment of rear bumper>

ROWEN rear bumper
requires separate brackets or collar and long bolts (M6).