Congratulations Larry! I was hoping to hear how that went for you (Log-book / race)….
I think the most effective silencers are going to be the steel wool / fiberglass packed chambered mufflers - I have seen people also add the SuperTrapp disc mufflers to the tips of the tailpipes. Must use a shield, however, to keep the blast from being drawn up to the bodywork of the rear clip.
Kudos again!!!