WAS-520 Fitting Instructions

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 or on special order (+50 euro) any RAL color
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 is included:
front subframe painted black
printed install instructions

Used in:
Audi A4 B6
Audi S4 B6
Audi A4 B7
Audi S4 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 pilots seats and crews seats due to the materials 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 for off-road, track, and racing applications only. We strongly advise mounting the subframe in a qualified and experienced workshop.

Audi B7 RS4