[BR3W CITY]

I have the area under the pedals modified, its actually kicked out 5.5", sloping from the floorpan up towards the main body seam at the firewall. So far, every place I've been has agreed its a mod to the floor, so the firewall rules didn't apply. My guess is they would treat you pretty much the same.

I see the firewall-specific rules for cages etc coming into play with things like the Stretchy Truck, which is rear engine and thus needed a rear bulkhead/firewall. Or AF/x cars where the firewall has been moved like 8".