I used this to replace a crappy rubber bellows that APR sent to connect the carbon fiber intake manifold to the carbon fiber intake manifold on my Audi S3 because I'm using stage 2 pressure built up + destroyed the accordion thereby restricting airflow and causing other problems. This completely fixed the problem. It's very well made and the double lug allowed me to add a little flex to the straight clutch. It works great and I can only recommend it.