3 SERIES G20 / G21

Exhaust systems and carbon fiber parts for the BMW 3 Series G20 / G21

If you drive a 320i, 330i or M340i, choosing an exhaust starts with your engine code. For the 3 Series G20 there are separate Valvetronic catback systems for the B48 and B58 engines, plus catted and catless downpipes for the B48. On the body side there are prepreg dry carbon fiber parts such as front lips, front grilles, side skirts and rear diffusers for the facelift (LCI) and pre-facelift G20. BYC Performance imports these parts from leading manufacturers around the world.

Exhausts by engine code

• B48 (320i and 330i): stainless steel and titanium Valvetronic catbacks, plus heat-shielded 200-cell catted and catless (de-cat) downpipes. These parts also fit the B48-engined 4 Series G22.
• B58 (M340i): stainless steel and titanium Valvetronic catbacks. The same systems also fit the B58-engined 4 Series G22 and 2 Series G42.

The catback replaces the line from behind the catalyst back to the tips. You open and close the valves with the electronic control box and wireless remote that come with the system. The titanium version is lighter than stainless steel and comes in gold, blue, purple or original titanium color. You choose the tips in matte carbon fiber, gloss carbon fiber, gloss black or stainless steel.

The downpipe connects the turbo outlet to the rest of the exhaust. The 200-cell catted model has a catalyst; the de-cat model does not. Before choosing the de-cat model, check the emission rules where your car will be driven. Ask on WhatsApp whether you will need a software update after a downpipe.

Facelift (LCI) and pre-facelift G20

The facelift changed the G20's front bumper, so the version matters for front parts. Parts with "LCI" in the name are for the facelift G20: AEC, BCT, KR, MP and TKD front lips, a front grille, a front bumper trim and a TKD rear diffuser. The LCI MP rear diffuser comes in separate versions for cars with square and round exhaust tips; choose by the shape of the tips on your car.

Parts without LCI in the name include a front lip, a front grille, vented front fenders, KR and TKD side skirts, a rear diffuser and an MP rear diffuser. Confirm on WhatsApp which version these fit before you order. The mirror caps are shared by the 3 Series G20 and 4 Series G22, and for the interior there are magnetic carbon fiber paddle shifters that fit F and G Series BMWs. All the carbon parts here come in gloss or matte finish, and you select one of the two on the product page.

Frequently asked questions

Do the front lips and diffusers fit the M Sport bumper?

The product names do not state a bumper type. Before you order, send your chassis code on WhatsApp and say whether your car has the M Sport package.

Are there parts for the G21 Touring?

No product name in this category mentions the G21. Ask before you order whether a part fits the G21 Touring.

Do G20 parts fit the M3 G80?

The M3 G80 has different bumpers, fenders and body dimensions from the standard 3 Series, so G20 parts do not fit it. For M3 parts, see the M3 G80 / G81 category.

How does delivery work?

Parts ship via partner couriers. Lead time for sourced-to-order parts is confirmed on WhatsApp right after your order. All parts carry a 24-month BYC warranty against manufacturing defects.