VERKLINE Rear Lightweight Tubular Subframe - B5 A4/S4/RS4

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VerklineSKU: WAS-501 DIY Difficulty: INTERMEDIATE


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After long CAD development based on 3D scan of OEM subframe, tested with CAD FEA (Finite element method) and road-going tests you can now buy brand new, rust-free, a subframe for the rear of your Audi B5 inc. A4 S4 RS4 and B4 80 / 90 Sedan/Avant inc. S2 and RS2.

Using the same T45 tubing as in WRC cars, our subframes provide increased stiffness and mass reduction. Our subframe also has a reinforced rear anti-roll bar mount. All factory parts bolt up to this unit, no modifications are necessary.


  • 10,5 kg, it is 6 kg (13.2 lbs) saving over OEM subframe
  • T45 (BS4T45 to BS4T100) tubing imported from UK and S355 metal sheets
  • All components TIG welded
  • Delivered painted (powder coated) black
  • Solid mounts to the car body for increased stiffness and additional mass reduction
  • Reinforced rear anti-roll bar mount. No other reinforcement is necessary (weight savings)
  • Can be used with OEM wishbones
  • Mounts to the OEM car body and no other modifications are needed to fit the subframe
  • Includes an extra hole 25 mm higher for drag racing -> anti-squat system

What's Included:

  • Rear subframe painted black
  • Printed install instructions

Fitment Details:

  • Audi A4 B5 Quattro
  • Audi S4 B5

For cars with older type rear subframe used in B4 cars, to use our subframe, newer longer type (320 mm, old type has 300 mm) of track rods have to be used (8D0 501 530) in the car.

T45 is a very unique seamless carbon-based steel tube that has been used in many applications in different industries. It is stronger than Co-Mo 4130 tubing that is also used in motorsport. It is widely used in the aerospace sector in equipment such as pilot’s seats and crew’s seats due to the material's ability to withstand high G forces without snapping or splitting. This material is a Carbon Manganese based and conforms to the full Aerospace Specification laid down by British Standards.

Tensile: 700 – 900MPa,
0.2% Yield 620MPa minimum
Hardness Test: 201min – 262 max HB or 210min – 275max HV.


  • 8D0505235J / 8D0 505 235J

Notice: Sold only for off-road, track, and racing applications. We strongly advise mounting the subframe in a qualified and experienced workshop that would know what they are doing.

Vehicle Fitment

Model   + Drivetrain  
B5 A4 1.8T I4 +
B5 A4 2.8L V6 +
B5 RS4 2.7T V6
B5 S4 2.7T V6

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