86pARTs | Rear diffuser | GT86 / BRZ I

86pARTs rear diffuser – Modular. Robust. Made in Germany.

The 86pARTs diffuser was developed for the track – not a show piece, but a functional aerodynamic component that delivers on its promises. Manufactured 100% in Germany from high-quality aluminum and black powder-coated, it stands for uncompromising quality, precision, and durability.

Cleverly thought out down to the detail:
The fins – with the exception of the two outer ones – are made of carbon fiber-reinforced plastic. This makes them not only lightweight but also quickly replaceable if the need arises. Even if you bottom out hard in the Nordschleife's carousel and destroy a fin, a replacement is no problem at all.

The modular design also ensures straightforward shipping and easy transport – even in the 86. Not a bulky, single-piece monster, but a clever, segmented solution with maximum everyday usability. Assembly is extremely simple and is shown in the installation video.

Stability rethought:
We weren't entirely satisfied with the mounts already on the market, so we completely redesigned the mounting systems and points. We use truly massive and stable brackets to fix the diffuser to the vehicle as securely as possible and to optimize its efficiency and stability.

Compatibility & Variants:
Included in the delivery are various inserts that can cover both centrally routed exhaust systems (such as Milltek) and side muffler outlets (such as Don Silencioso-Roar).
Depending on the exhaust, minor adjustments to these inserts cannot be entirely ruled out (see list below).

Installation is carried out without any adjustments to the original body points (only minimal processing of the side panels is necessary for the Aero or TRD rear). All brackets are designed to be massive and are attached to stable support points.

The diffuser is now supplied with adjustable rear brackets, making it compatible and tested for the facelift GT86 and BRZ as well!

Confirmed fitment for the diffuser (without adjustments):
Milltek
Don silencioso Roar
Fox
DTH

Adjustment necessary:

Invidia N1

Scope of delivery:
Complete assembly set including brackets, bolts, edge protection (heat-resistant under the tailpipes), and all mounting hardware. This makes installation easily manageable, and there is nothing standing in the way of an individual certification (Einzelabnahme).

The test report is available to the TÜV and can be easily retrieved by the respective inspector. Development took place in constant contact with the TÜV, so the diffuser meets all requirements to be registered via individual certification. The corresponding part number on the type plate is permanently attached to the diffuser.

You can find the PDF version of the manual here. We estimate the workload for an initial installation to be 1 hour for assembly and another hour for mounting it on the vehicle.

Performance meets design:
In addition to the aggressive look, the diffuser also delivers measurable benefits: It reduces turbulence in the axle area and provides more stability and downforce on the rear axle – noticeable on both the road and the track.

Black powder-coated, with black bolts and clean lines – a part that fits, functions, and is simply GreenFuchs-approved.

The part weighs a total of 5.5kg, but every gram gives you improved aerodynamics.

Here you can find our TÜV supplementary sheet with all the necessary information your inspector needs for an individual certification.

Price transparency note:

Unfortunately, we had to raise the price of this item in August 2026, as we could no longer maintain our old purchase prices with the new batch. Aluminum makes up a large part of this, and prices there have risen rapidly. We are not enriching ourselves with this, but are only passing on the increased costs so that we can continue to offer you such awesome products in the future. Should prices fall again in the future, the retail price will also drop – although I think everyone can judge for themselves how realistic that is these days.