Transmission shield or tunnel cover

duster drag car: you don't have to bend over to the mopar gods once again as every hotrod of a certain et has to have a tranmission shield also and the rest of the parts you were short on to pass tech. it's not that it's a mopar it's that you want to drag race. also as you get to wanting to go faster and faster the tech guys will require you to have even more safty stuff no matter what make hotrod you have.
another thing, if you have two hotrods that are the exact same hp, chassis, etc. except that one weighs less that one will be faster. just like you mentioned weight to hp.