I know you're kidding around and I'm sure you know this already but weight loss helps regardless of the car son. Extra weight in a Volvo is no different than extra weight in a Porsche. And honestly our cars are pretty light, It looks like I only have about 200 pounds on your gti. (without my dynamat and sound system)
Anyway I'm assuming Gdog was more concerned with added weight causing stress to the already shitty dash mounts, not quarter mile times. I actually added dynamat to the dash itself and any exposed metal behind it. That coupled with the reinforced fiber glass, the dash makes literally zero noise for probably the first time in over 10 years.