i just got a 86 cutlass that i want to fix up and make into a weekend car. dont plan on taking it to the track. just the local car shows and cruise around town. since the fuel level sender is bad, and i have an extra fuel cell around i am planning on putting it in the trunk and tossing the fact. fuel tank. i am going to vent it through the floor and cut out a spot for the sump to run the lines under the car. my question is do i have to put a fire wall against the rear seats. and if so do i have to put one under the speakers since there are a few holes on that panel. and if so what material does it have to be made out of. tin, aluminum, steel. i would like to know if anyone is running a street car without a rear firewall.