Chainsaw Repair

Hey Y'all-

I wanted to ask if anyone can give any comments about the different muffler part numbers that are listed on the echo IPL's. All have the 59 cc engine.
Here's a chart I made:

saw                         muffler #                 inner deflector YES/NO
------------------------------------------------------------------------------
cs-590                      A300001570                      NO
cs-600P (early)         A300000770                    YES
cs-600P (current)     A300001570                     YES
cs-620P                    A300001810                      NO

Also, I noticed the part numbers for the outer deflectors is not the same for these models.

Has the mounting or cylinder shape changed between these saws? Or are some part# better flowing, or catalytic converter types? Thanks again.

i can only speak first hand on the cs-590 (early).

from what i see on my saw, it came equipped with an inner deflector.  maybe have a pic of this somewhere.

pic: http://chainsawrepair.createaforum.com/index.php?action=dlattach;topic=3434.0;attach=8108;image

on the cs-590 there are two different IPL's:
early-Serial Number: C25812001001 to C25812999999
late  -Serial Number: C25913001001 to C25913999999

on the early IPL: the inner exhaust guide part #A313000020 is no longer available.  the outer exhast guide alternative part # that is currently available is part #A313000120.

my saw is loud enough already, with the inner guide in place.  don't feel the need to take it off, to make even more noise.

maybe checking muffler gasket part #'s you can find if the different mufflers interchange between models 590, 600, 620???

have not been inside my muffler, but word on the street is that it has some kind of tube gizmo within.

regards
-joe