Thermo Reactor Inserts
 

Remind me if the big thermo reactor insert goes in the front or back? When I remove the exhaust on my 1979 they dropped out before I could see where they go.

I know they are keyed so that isn't an issue with which direction the large opening faces. Looks like the opening of the large one faces the front of the car.

bump

I have mine with the long one to the rear, opening facing forward.

Makes sense if you think of trying to keep the path lengths equal.

Thx