Hot Rod Forum : Hotrodders Bulletin Board - View Single Post - Purple Hornies Anybody?
View Single Post
  #2 (permalink)  
Old 07-24-2009, 10:40 PM's Avatar is online now
Last photo:
Join Date: May 2002
Location: Holly, michigan
Posts: 8,712
Wiki Edits: 0

Thanks: 64
Thanked 426 Times in 390 Posts
The perforations just let the sound/pressure waves expand into the outer chamber. The tone of the muffler can be changed by the number and placement of the slots or perforations.
Reply With Quote