Just as the topic says. I've swapped a tunnel and realized there ain't chit on these things for metal. Then u read about people bitching how heavy these sleds are and wonder where the hell is it gonna come from? All the weight of these sleds is in : hood, exhaust and motor. They have to pass emissions and noise so they can't touch the exhaust or the hood so....... Do u want them to make a hollow crankshaft or do u want them to take more out of the chassis? I think there are a few chassis areas where I'd like to see it heavier