I have always hated exterior bits that serve no real purpose. Faux brake vents; solid grilles — that sort of thing. The stock MCS rear bumper has two fake grilles that have always driven me nuts. With the way the bumper cover is designed, the rear valance hangs down in the airflow coming under the car. It always looked like you could just open up the grilles and let the air flow through the bumper. But things are never as easy as they seem.
The first thing you notice when looking at the rear of the car is that there is a lot of heat shielding. With the stock “2-ball” design, this made sense, but once you’ve converted to a single sided exhaust, you really do not need all of that shielding or the exhaust hanger on the unused side. Once I painted the new bumper, I thought I’d try to experiment with airflow through the bumper. I started by modifying the heat shielding on the exhaust side to flow better toward the outlet. On the driver’s side, I trimmed the heat shielding back and channeled the airflow directly toward the vent. I’ve been running without vents at all for a couple of months. From most angles, you really can’t tell anything is missing, but when you are directly behind the car, it just looks wrong.
I tried looking through the usual online catalogs for a low cost, free venting solution, but all seemed outrageously priced to me. Enter Home Depot. Since I had an extra set of vent grilles, I decided to break out the jig saw and dremmel and see what I could come up with. After a couple of experiments, here’s what I produced. It’s not going to win me any concourse competitions, but from 5 feet, they look pretty good. They are made from the same gutter-guard material as my front grille, so it provides a certain low-budget symmetry I should think.