I am not really sure if they are interchangeable, but post #8 in this thread seems to sum it up
http://www.aleromod.com/forums/showthread.php?t=22105
Quote:
Cliff8928: Well, FE2 is standard (in the Alero, there is no FE1 unlike some cars).
With the FE3 you get...
225/50R16 Goodyear Eagle RS-A tires.
Solid front sway bar
Stiffer Springs
firmer bushings
firmer struts
As far as i know, all GX and GL1 models are FE2. All GL2 models are FE3. GLS is standard with FE2, FE3 is optional.
I'm sure if i messed something up Mfuller could correct me on that one.
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