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This mod has been done primarily to 87+ mk1s due to the fact that the stock air filter box lays right there under that custom installed vent. 85/6 vehicles had the stock airbox in the engine bay.
I wouldn't want to hack up the rear firewall of the engine bay to run piping to the trunk and have a side vent there, however it is probably the best option for 87+ cars that want to retain the stock airbox configuration while getting rid of the excessive piping running through the trunk, all the way to the passenger side vent.
I have had thoughts about cutting the rear 1/4 panel right there and putting a vent, but have not done it.
It does not look proportional to the passenger side. If you do want that fresh air from the side of the car vs. the hot engine bay and you already have the stock intake box mounted in the trunk like all 87+ cars .. a smaller cleaner cut can be made. V8Eater's blue mk1 had it done a long time ago. I do not have a photo handy to show, but it's a much smaller custom scoop alike hole in the side panel that directs air into the stock airbox.
Verdict is, you may not gain a whole 5hp, but you will gain cooler air which will result in the car running better.
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