I don't see why you would want to cut the slots in front exhaust port on your side cover. It leaves a good chance for you to burn yourself or your rope with very little noticable difference in the way the saw runs. I have not mod my saws at all and they run great. I have seen people tinkerwith stuff they shouldn't have and then there saws don't run worth crap. Keep good fuel in it and a clean air filter and a sharp chain on it and it will preform wonderfully.
Actually its just the opposite: cutting the baffle out keeps it from burning the plastic as much. Less mess, and less hot plastic to burn me. Also keeps it looking a little cleaner if I decide to sell it later.
The muffler actually sits 7/16" behind the baffle, and the whole we cut is 1" x 1". You won't get burned unless you stick your finger or something else 1" in there lol. You would have to deliberately put something in there, and its only going in 7/16" so maybe if you deliberately put the end of your rope in there you might burn the end idk. I've never been burned by it, nor had it burn anything, and I've had it that way since they came out with the 192.
And I completely disagree, along with removing the limiting caps, it was a VERY noticeable difference. Just did one on my buddy's brand new 192, after he'd run it for a week, and he says the same thing - really wakes that little saw up.
I dont disagree with your advice though, use good fuel, quality mix, clean filter and sharp chain and you should be ok, and you shouldn't mess with them unless you know what you're doing or can afford to fix it if you screw it up.
For the average guy tho, eventually that screen will plug up -- it can be cleaned, yes, but these mods are very simple, and took like 5 minutes and the guys here in town rave about it.
Also, the mod on that particular saw was done by a stihl mechanic, the one who showed me that in the first place.