Sorry kids to deal with. I did the intake boost porting on my 346xp husquvarna (read 50cc chain saw) I noticed better bottom/mid range power. Top end isnt as important on a saw. But i ran about 100 to 150* cooler on exhaust temps. I leave about a 1/8" "bridge" so the ring has something to ride on in between where groves meet above the intake. The exhaust side is kinda hard to do because of the thin cylinder design. Nessesitating the external tubes. Think of it as a modified bridge port exhaust.