N, I dnt, sry. Mb u cn fnd thm w a srch? Smbdy mb pstd smthng smlr 2 wt u wnt. Jst lk thru th pst psts hr, nd mb u wl fnd smthng.
I was thinking too. If your pop knows all these dudes, they must know how to build some monster voice amp. Why not just show them the space in the helmet and tell them what you want?