Need some Translations :)

hi there guys
I Hope someone can help me
I´m from Germany and i actually working on a Translation for upcoming PC game.

More infos for the game :

http://www.automationgame.com
http://www.automationportal.net (german)

So i need some technical Words for some Exhust parts..

Buffled Muffler
Reverse Flow Muffler.

The translators in world wide web are not technical enough for that I hope someone can help me

greetings From Germany
Martin