[BRUTAL64]

Originally Posted by Throttle Crazy

If it was pressure traveling directly against the exhaust from another source it would be by definition an opposing pressure not a back pressure. One pressure would not need the other to exist.
Main Entry: op·pose
Pronunciation: ə-ˈpōz
Function: transitive verb
Inflected Form(s): op·posed; op·pos·ing
Etymology: French opposer, from Latin opponere (perfect indicative opposui), from ob- against + ponere to place — more at ob-, position
Date: 1579
1 : to place over against something so as to provide resistance, counterbalance, or contrast
2 : to place opposite or against something
3 : to offer resistance.

What do the French know?