Collection: BMW 3 Series G20 | G21 | G28 (2018 - Present)
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You are now browsing for BMW 3 Series G20 | G21 | G28 Parts & Upgrades
Here at String Theory Garage we stock a large and ever expanding range of BMW Parts. A complete range of upgrades. From Suspension upgrades to ECU tuning we have you covered.
We also offer full fitting with ride-height, corner balancing, and geometry setup as well as other services from our garage in Stratford upon Avon.
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AST Adjustable Lowering Springs - BMW 3 Series (G20) 330e | 330i | M340i (2018 - Present)
Regular price £750.00 GBPRegular price£780.00 GBPSale price £750.00 GBPSale -

AST Adjustable Lowering Springs - BMW 3 Series (G21) M340i | M340i Plug in Hybrid (2018 - Present)
Regular price £750.00 GBPRegular price£780.00 GBPSale price £750.00 GBPSale -
AST Suspension 5100 Competition 1-way Adjustable Coilovers - BMW 3 Series G20 | G21
Regular price £2,875.00 GBPRegular price£2,970.00 GBPSale price £2,875.00 GBPSale -
AST Suspension 5100 Street 1-way Adjustable Coilovers - BMW 3 Series G20 | G21
Regular price From £2,083.33 GBPRegular price£2,170.00 GBPSale price From £2,083.33 GBPSale -
AST Suspension 5200 2-way Adjustable Inverted Coilovers - BMW 3 Series G20 G21
Regular price £4,208.33 GBPRegular price£4,330.00 GBPSale price £4,208.33 GBPSale -
AST Suspension 5300 3-way Adjustable Inverted Coilovers - BMW 3 Series G20 G21
Regular price £4,500.00 GBPRegular price£4,590.00 GBPSale price £4,500.00 GBPSale -
BMW M340i / M440i (G20 / G21 / G22 / G23 / G26) | OPF/GPF | Akrapovic | Link Pipe Set (SS)
Regular price £1,137.84 GBPRegular priceSale price £1,137.84 GBP -
BMW M340i / M440i / Z4 M40i (G20 / G21 / G22 / G23 / G26 / G29) | Akrapovic | Downpipe w/ Cat (SS)
Regular price £1,984.50 GBPRegular priceSale price £1,984.50 GBP -
BMW M340i / M440i / Z4 M40i (G20 / G21 / G22 / G23 / G26 / G29) | OPF/GPF | Akrapovic | Downpipe w/ Cat (SS)
Regular price £1,948.65 GBPRegular priceSale price £1,948.65 GBP -
BMW M340i / M440i Gran Coupé (G20 / G21 / G26) | OPF/GPF | Akrapovic | Slip-On Line Exhaust System (Titanium)
Regular price £4,819.83 GBPRegular priceSale price £4,819.83 GBP -
MMX Billet Air Conditioning Caps | BMW | Grey OEM-Style
Regular price £20.83 GBPRegular priceSale price £20.83 GBP -
MMX Billet Aluminium Fuel Filler Cap for all BMW Models
Regular price £87.36 GBPRegular priceSale price £87.36 GBP -
MMX Billet Aluminium Oil Filler Cap Gloss Black - BMW - 11128655331
Regular price £81.89 GBPRegular priceSale price £81.89 GBP -
MMX Billet Gear Shift Knob for BMW (All 6 Speed Manual Cars)
Regular price £104.99 GBPRegular priceSale price £104.99 GBP -
MMX Billet Washer Fluid Cap | BMW G-Series | Gloss Black | MMX Logo
Regular price £41.66 GBPRegular priceSale price £41.66 GBP -
MMX Gear Shift Paddles | BMW G-Series Inc. LCI | Titanium Magnetic Paddle
Regular price £224.99 GBPRegular priceSale price £224.99 GBP -
MMX Gear shift paddles | G Series | Titanium Magnetic Paddle Inc Fitting kit
Regular price £269.99 GBPRegular priceSale price £269.99 GBP -
MMX Hubcentric Wheel Spacers for BMW G-Series 12mm | 15mm | 18mm
Regular price From £78.75 GBPRegular priceSale price From £78.75 GBP -
MMX Lifetime Stainless Steel Oil Filter – BMW B58 & B57 (3.0L) - 11427826799
Regular price £52.49 GBPRegular priceSale price £52.49 GBP -
MMX Locking Tapered Seat Wheel Nut Kit for BMW
Regular price £39.99 GBPRegular priceSale price £39.99 GBP -
MMX Lowering Springs | BMW G20 M340i & M340d RWD
Regular price £212.93 GBPRegular priceSale price £212.93 GBP -
MMX Lowering Springs | BMW G20 M340i & M340d xDrive
Regular price £212.93 GBPRegular priceSale price £212.93 GBP -
MMX Lowering Springs | BMW G20 M340i & M340d xDrive (2019+)
Regular price £177.44 GBPRegular priceSale price £177.44 GBP -
MMX Magnetic oil sump plug for BMW & MINI
Regular price £24.20 GBPRegular priceSale price £24.20 GBP


















