Mark,
I havent seen that saw, but wiley_p, who really knows his Stihl saws, ran one, and was very underimpressed. (he has 2 036's ,as I have had.) Could be the muffler sounds was what fooled him. Might it be a catalytic? Whatever, I think it is Stihl's first motor design with closed quad ports like the Huskys...and that should be a good thing.
Rocky, the 361 is shown an 12.3 lb, 0.2 lighter than the 360, but still heavier than a 357.
Also, I'm convinced Stihl is telling little white lies with their power numbers being essentially unchanged of late, even though they now sell saws with miniscule exhaust ports.
Go to ASite for tons of info on muffler modding, and builders that can do the whole saw for you. I have a modded 357 Husky on its way to me that has recorded cut times equal with a stock 6.2 hp Dolmar 7900...which happens to be the most advanced engine design ever in a saw..and the best pwr to weight. Edit, I said that already earlier...do I sound anxious to get the 357 or what?
When I dual ported the muffler on one of my older 036's, which had a single opening almost double the area of the current horribly choked up Stihl's, the saw made at least 20% faster cuts.
Another thing, opening mufflers will allow saws to run cooler, and richer....(screw the EPA), but even so, you might consider switching to a full synthetic mix like Mobil MX2T, mixed at 32-1 to 40-1. It makes a world of difference, less smoke, no carbon build up inside...fabulous stuff, and comparable in price to regular Stihl dino mix.
If you run 044, 046 and 066's, ask your dealer. to sell you ported front covers that will convert the saws into real powerhouses. As well, dremel the existing port to 9/16 - 5/8 round, and open the deflector a tad. The 088, with it's odd muffler, I don't know what to do there.....
There's more to the issue though, as wiley_p found with his 046, which had to have expensive carb mods to allow it to handle the extra fuel flow needed with all the extra horsepower provided by the muffler mods...so be careful, make sure you can adjust the carbs correctly after muffler porting.
Another thing, come 2005 or therabouts, the full restrictive EPA guidelines come into effect throughout the US...who know what that means for the 200T? Maybe nothing? I think it can still be sold in Ca, but the 335/338 can't. So maybe we should all consider stocking up on our favorite saws.