...I've been a car enthusiast for years and an engineer by trade. I now own and operate a custom car speed shop. I learned years ago about venting through the rear of the hood. I have done this modification on virtually all makes and models of cars and usually it's the first thing I do. Hot air is actually sucked out from the engine compartment by the venturi created by the air flowing over the windshield. It is harmless with the only drawback being that it also allows hot air to be drawn into the passenger compartment by the hvac system, the base of the windshield is also where the air intake is for the hvac. What we have done is to just leave a short ,18 inches, piece of the weather-strip on the passenger side. It stops the vent air from feeling like an oven and smelling like a hot engine in the car. Very little water enters through the opening because the turned up lip stops it and with the PT it is several inches toward the front...An added bit of info...finish off the sharp edge that's left exposed with a piece of door edge guard, either black or chrome and it will look good and won't cut you up while cleaning the car. We also have experimented with various opening sizes...the result is anything over about 1/4" is no gain. The amount of air coming out is in direct relation to the speed of the car...so open the sunroof and run up to about 100 mph and just stick about 1/2 of your finger out and see just how much air is being pulled out...We also have found that with small displacement engines they never get to operating temperature in extremely cold weather, they actually become 'air cooled'. With the PT we get multiple positive affects from this no cost modification...it is one of the few cars that actually have a complete seal all around the hood..so the venting out the back is quite efficient...just some info for your evaluation assistance. If you want to look further into it, it also stops the positive pressure from building up under the hood and the increased flow through the radiator is tremendous...Hate to keep rattling on but we also have noticed that in the summer fewer bugs will hit your windshield with the flow of air out and over the glass!
Inferno red GT/R-package/heated seats/rear wing/5-speed
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