To avoid Mario making Koopa Troopa sounds, use BrawlCrate to open your revo_kart.brsar and replace index 480 with the included .brbnk file. After that, go to index 637 and replace
audio 102, 103 and 104 with the included WAV's and then save!

If you don't want to bother replacing these files and you aren't using another revo_kart.brsarr already, I've included a pre-made vanilla revo_kart for you with these sounds replaced
for your convenience ^^ enjoy!!

