well i did e-mail the seller with a few questions. acting like i was interested in having work done to my saw. i might pass for now. this is what is reply was.
" Hello, Jeremiah. To do all the work on the MS-361 your looking at about $300.00. They go in and clean up the exhaust port and intake ports. Then from there you can do muffler mods. set the ring gap lighten piston and rebalance all rotating mass. And then if you'd like you can change the porting. deck the cylinder boosting compression Also on the newer 361 chainsaws with the new microprocessor controlled ignition system you can re-program it to your specs. as you know from running your saw it is not much on low and mid range torque this will drastically change that and also make the higher end more torquey as well. it also reduces the cylinder operating temps making the saw last much longer and as you are well aware im sure especially in 2 stroke cooler temps means more usable hp. Makes a huge difference. Thanks for the interest."