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 £900.00 GBPRegular price£936.00 GBPSale price £900.00 GBPSale -

AST Adjustable Lowering Springs - BMW 3 Series (G21) M340i | M340i Plug in Hybrid (2018 - Present)
Regular price £900.00 GBPRegular price£936.00 GBPSale price £900.00 GBPSale -
AST Suspension 5100 Competition 1-way Adjustable Coilovers - BMW 3 Series G20 | G21
Regular price £3,450.00 GBPRegular price£3,564.00 GBPSale price £3,450.00 GBPSale -
AST Suspension 5100 Street 1-way Adjustable Coilovers - BMW 3 Series G20 | G21
Regular price From £2,500.00 GBPRegular price£2,604.00 GBPSale price From £2,500.00 GBPSale -
AST Suspension 5200 2-way Adjustable Inverted Coilovers - BMW 3 Series G20 G21
Regular price £5,050.00 GBPRegular price£5,196.00 GBPSale price £5,050.00 GBPSale -
AST Suspension 5300 3-way Adjustable Inverted Coilovers - BMW 3 Series G20 G21
Regular price £5,400.00 GBPRegular price£5,508.00 GBPSale price £5,400.00 GBPSale -
BMW M340i / M440i (G20 / G21 / G22 / G23 / G26) | OPF/GPF | Akrapovic | Link Pipe Set (SS)
Regular price £1,365.41 GBPRegular priceSale price £1,365.41 GBP -
BMW M340i / M440i / Z4 M40i (G20 / G21 / G22 / G23 / G26 / G29) | Akrapovic | Downpipe w/ Cat (SS)
Regular price £2,381.40 GBPRegular priceSale price £2,381.40 GBP -
BMW M340i / M440i / Z4 M40i (G20 / G21 / G22 / G23 / G26 / G29) | OPF/GPF | Akrapovic | Downpipe w/ Cat (SS)
Regular price £2,338.38 GBPRegular priceSale price £2,338.38 GBP -
BMW M340i / M440i Gran Coupé (G20 / G21 / G26) | OPF/GPF | Akrapovic | Slip-On Line Exhaust System (Titanium)
Regular price £5,783.80 GBPRegular priceSale price £5,783.80 GBP -
MMX Billet Aluminium Fuel Filler Cap for all BMW Models
Regular price £104.83 GBPRegular priceSale price £104.83 GBP -
MMX Billet Aluminium Oil Filler Cap Gloss Black - BMW - 11128655331
Regular price £98.27 GBPRegular priceSale price £98.27 GBP -
MMX Billet Gear Shift Knob for BMW (All 6 Speed Manual Cars)
Regular price £125.99 GBPRegular priceSale price £125.99 GBP -
MMX Gear shift paddles | G Series | Titanium Magnetic Paddle Inc Fitting kit
Regular price £323.99 GBPRegular priceSale price £323.99 GBP -
MMX Hubcentric Wheel Spacers for BMW G-Series 12mm | 15mm | 18mm
Regular price From £94.50 GBPRegular priceSale price From £94.50 GBP -
MMX Lifetime Stainless Steel Oil Filter – BMW B58 & B57 (3.0L) - 11427826799
Regular price £62.99 GBPRegular priceSale price £62.99 GBP -
MMX Locking Tapered Seat Wheel Nut Kit for BMW
Regular price £47.99 GBPRegular priceSale price £47.99 GBP -
MMX Lowering Springs | BMW G20 M340i & M340d RWD
Regular price £255.52 GBPRegular priceSale price £255.52 GBP -
MMX Lowering Springs | BMW G20 M340i & M340d xDrive
Regular price £255.52 GBPRegular priceSale price £255.52 GBP -
MMX Magnetic oil sump plug for BMW & MINI
Regular price £29.04 GBPRegular priceSale price £29.04 GBP -
MMX Performance Billet Oil Filler Cap – BMW S58 & B48E - 11128654637
Regular price £98.27 GBPRegular priceSale price £98.27 GBP -
MMX Performance Car Badge – Chrome or Gloss Black (100mm)
Regular price £9.83 GBPRegular priceSale price £9.83 GBP -
MMX Performance Cotton Gauze Panel Air Filter – BMW B48 / B58 / B58TU
Regular price £78.61 GBPRegular priceSale price £78.61 GBP -
MMX Performance Magnetic Differential Plug – BMW (M22 × 1.5)
Regular price £28.82 GBPRegular priceSale price £28.82 GBP


















