Boxster Immobilizer Module- under seat

[Steve Tinker]

Oldie....
Don't you get water ingress when driving in rain with just a hole drilled in the floor pan?

[old911doc]

No, nary a drop. The area of the immobilizer is well away from the spray pattern from the front tires, and the floor pan is about six inches above the road surface. I would never attempt to cross water that deep in a sports car of any type, and would be very careful about doing so in a large pickup truck. A high percentage of flood-related fatalities occur when drivers deliberately drive into water of unknown depth.
Even if the car suffered a quick, temporary exposure to water deeper than the car's floor pan, the rate of water entry through a 3/8" hole would be slow, so, as long as the exposure was brief, the water entry should be limited.

[old911doc]

When I drilled my Boxsters I recalled there is an ideal part to fit in the hole, an original Porsche part 911.631.259.02, available from our friendly Pelicans for $3.00 each. This part is a small rubber tube used in 1960's-70's 911's, fitted into each turn signal unit to permit water to drain out without water easily splashing in. I would suggest purchasing four of them, and measuring the groove in the rubber to see what size hole to drill in the floor pan. I suggest one hole in the lowest point, which is under the seat, and one hole near the back of the floor pan.