Firewall heat/sound proofing material?

[macwolf]

Can anyone let me know what they have used successfully for heat/sound proofing of the firewall - and also whether this is even necessary?


I have seen most pics of completed Pitts just appear to have a blank firewall, but it's often difficult to see as they are cockpit photos, and it's pretty occluded - so they might have something there that I just can't see.


What's the generally recommended practice ?


Thanks!

 

[wassbiplane]

 

[bigblackmastiff]

 

[wassbiplane]