Well, I’m done with my MK4 gocart. Sound deadening material will marginally decrease the room in the foot box (and other areas) and I need every fraction on an inch achievable. My thought that the Cobra is the last of the LOUD, SCAREY, OPEN AIR, HAIRY-CHESTED DEATH MACHINES, so what I’m I sound deadening against? I’m definitely going to use thermo sheets in the engine compartment for the foot boxes. But Really, is the rest really necessary???