Bilstein B4 1980 Audi 4000 Base Rear Twintube Shock Absorber Suspension>Coilovers High Quality Tube: This system

High Quality Tube: This system uses a high quality plastic

the couplings included with this torque boost tube kit are engineered to be resistant to cracking and sustain prolonged periods of high-temp conditions

The Serrated/Helix design creates air turbulence in the intake manifold to increase air pressure in the combustion chamber resulting in increased horsepower

With 12-point hardware engineered to prevent nut rounding

but it's not perfect

Bilstein B4 1980 Audi 4000 Base Rear Twintube Shock Absorber Suspension>Coilovers High Quality Tube: This systemBilstein B4 OE Replacement dampers are specifically engineered to be the best choice for maintaining the original ride quality of your vehicle, while meeting or exceeding OE standards. These dampers are the ideal choice for the driver looking to restore the original performance and handling of their vehicle, with the added benefit of world famous Bilstein quality.