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Our first mod: An Edelbrock cat-back exhaust system. While not something we would normally do trackside, we were fortunate enough to have the track rented for our testing exercise. But to our own chagrin our exuberance and enthusiasm were quickly tempered as we wasted the entire day dealing with rusty bolts and broken nuts (figuratively speaking, of course) to get the old exhaust out. Once the new Edelbrock exhaust was bolted into place, we lost out on the weather advantage as the temperature soared from 88 to 91 degrees Fahrenheit, but we did see a drop in time to 15.037 at 91.45, so we gained 0.217 seconds and .34 mph.