BMW 3 Series & M340i G20 G21 Carbon Fibre Competition Side Skirts by FORM (2019 on)

The FORM Performance Side Skirts for the G20 3 Series are constructed of lightweight carbon fibre and add well needed drama to the side of the vehicle. Available from Forge Automotive supply only, or fitted at our sites in Darwen and Leeds.

They are designed around OEM parts with 3D CAD to guarantee the best possible fitment for an aftermarket item.

Key features

• Competition side skirts, left and right
• Carbon fibre (CFRP, 2x2 weave)
• Designed around OEM parts with 3D CAD
• Fitting hardware included

What's in the box

• 2 x carbon fibre side skirts (left and right)
• Fitting hardware

Fitment

• BMW 3 Series (2019+, G20 G21)
• BMW M340i (2019+, G20 G21)

Supplied, fitted and finished by Forge Automotive

Forge Automotive can fit these side skirts at either of our sites: Darwen in the North West or Gildersome, Leeds in Yorkshire. Forge Automotive can also finish these side skirts before fitting: paint protection film (PPF) to guard the carbon, a colour change or satin wrap, or colour matching to the car. Ask when ordering. See more BMW 3 Series G20/G21 parts.

Common questions

What is wet-lay carbon fibre (CFRP)?
Wet-lay carbon is made by laying dry carbon cloth into the mould and applying resin by hand, then curing at room temperature or low heat, sometimes over a fibreglass or composite base. It gives the same 2x2 weave look as pre-preg for less money. The trade-off is more resin and a little more weight, and the finish depends more on the maker, which is why we only stock wet-lay parts from brands whose quality we have seen.

Is wet-lay carbon strong enough for a splitter or diffuser?
Yes for road use. The part is still carbon reinforced and stiff enough for a splitter, skirt or diffuser. If you want the lightest, most rigid option, choose the pre-preg version where the range has one.

What is a 2x2 twill weave?
The weave pattern in the carbon cloth. In a 2x2 twill each strand passes over two and under two, which gives the diagonal pattern BMW use on their own M Performance and M carbon parts. Choosing 2x2 means aftermarket and factory carbon on the same car match.

How do I look after a carbon fibre part?
Treat the lacquer like paint: wash with pH-neutral shampoo, avoid harsh solvents, and wax or seal it. UV is what ages carbon, so a protected finish lasts longer. Forge Automotive can apply paint protection film to any carbon part before fitting, which guards against stone chips and keeps the weave clear.

Fitting is available on every part at our North West (Darwen) and Yorkshire (Leeds) workshops. Prefer to fit it yourself? Fitting instructions ship with every part.

In-stock parts ship in 3–5 working days, fully insured. Every part is fitment-checked before dispatch.

Covered by the manufacturer warranty. Fitting through our workshop keeps it intact.