Difference between 066 Mag and plain 066??

[Straubies]

I was just wondering if anyone can tell me the difference between an 066 Mag and a plain 066. Is there a difference between the displacement or is the mag just like being "West Coast/ "Walkerized??  
         Any information would be appreciated!
 Thanks,
 STRAUBIES

[Kevin]

I'm (almost certain) that the porting is different on the two models.

[rahtreelimbs]

I was told years ago by a Stihl rep that the only difference was that the 066 Mag had the dual-port muffler.

[ehp]

When you could buy a 066 or a 066 MAG. in Canada , the difference were the mag.had a dual port muffler and the carb was different,it had a limiter in it.The jugs are the same each year for the both but did come in different styles like no decompressure on the old saws

[Straubies]

   Thanks guys for the responses.  I knew there had to be a difference between the saws.  
 Thanks again,
 Straubies