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Message: <blockquote data-quote="wkwoo69" data-source="post: 42845" data-attributes="member: 101">Gosh, the heating prob is something new. Hamann's current style is NACA-style ducts on the bonnet (think Lambo Countach / F40 - the triangular one), but it is pointed outwards, i.e. for flow inwards. What you could do is point it backwards, for venting.  There's no doubting the efficacy. You can actually see the wavy distortion looking through the heat rising through the vent from inside the car. You have to be extremely careful where you cut the bonnet though, due to water. What you could do is to zip tie some clear plastic below the hole to act as a water funnel. I've seen this on WRXs (which has two vent holes but are covered from the factory) and it looks tolerable because its clear plastic. Alternatively, get the duct tape handy for rainy days...I find that the sound deadening felt used in my car is perhaps too effective for blocking heat as well  - the middle of the bonnet is stone cold after a long drive (at night). Maybe you should consider removing it, so some of the heat can dissipate through the bonnet? But the downside is increased noise, and uncertainty as to how much temp change can be attributed to the bonnet.</blockquote>