Car has hissing sound when initially accelerating
Hi there, thanks for writing in about your 2006 Porsche Cayman. Generally, a hissing noise will come from a leaking vacuum (https://www.yourmechanic.com/article/is-it-safe-to-drive-with-a-vacuum-leak) source or something like an exhaust manifold gasket (https://www.yourmechanic.com/services/exhaust-manifold-gasket-replacement). The vacuum leak will cause some performance issues as...