To help combat vacuum leaks, which can lead to reduced engine performance, we are pleased to offer this replacement silicone hose from Forge Motorsport. The 225hp 1.8T engine in the MK1 Audi TT has an organic rubber hose on the intake manifold that feeds the brake vacuum system. This hose is prone to failure leading not only to a loss of engine power but also brake efficiency. The OEM replacement is only available with the hard lines included, which creates unecessary expense. This replacement hose is a cost effective replacement or a precautionary replacement to avoid the potential failure. If the hard lines on your vehicle are damaged, then you should replace them immediately with suitable OEM parts.