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 a brand new, rust-free, subframe for the front of your Audi B6/B7 A4 S4 RS4.

Using the same T45 tubing as in WRC cars, our subframes provide increased stiffness and mass reduction. Additionally, the design enables better access to the car's underbody. All factory parts bolt up to this unit, no modifications are necessary.

Some of the cars using the subframe are posted below.

Features:

• 8.5 kg, it is 7.5 kg (16lbs) 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
  
• Can be used with OEM wishbones
  
• Mounts to the OEM car body and no other modifications are needed to fit the subframe
• Includes subframe alignment holes and xenon lights mounts (B6/B7 version)

What's Included:

• Front subframe painted black
  
• Printed install instructions

Fitment Details:

• Audi A4 B6/B7
  
• Audi S4 B6/B7
• Audi RS4 B7

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.

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

Replaces:

• 8E0399313BG
  
• 8E0399313AM
  
• 8E0399313M

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.