Hello together, have the following problem I’m just normal as usual with the car on the highway with an average of 160 driving at once I notice a strong power drop and a hissing from the exhaust or from the region where the exhaust is located. If I don’t give a gas the engine is quite normal. Faster like 130 I can’t drive now let alone uphill I have to switch down to the 3 gear so I can get up to some extent. I have to say the car doesn’t belong to me but to my girlfriend and I don’t have any idea of cars either. Maybe someone has an idea what it might be? Ps: Guilty people that there are so few punctual characters in here and that the gramatics is so bad but had to write it with an iPhone because I don’t have a pc here. Greeting Dennis