Why do you AS members insist on the bigger model every time? Examples Stihl 056 super vrs mag two, Husky 365 vrs 372, Poulan 505 vrs 475. It has to be a "mines bigger" thing. I have run all these models and sometimes the smaller version is faster. Not always but enough so that a handfull of ccs doesen't always matter. The real puzzler is why the smaller version sells for sometimes $200 less. You guys are missing out on some real bargins by holding out for a few more ccs. I have built and hopped up a lot of 181/281s that will kick a 288 everytime. Especially the small combustion chamber thin ring 181. The 064 and 066 are another pair. Do a blind test sometime. I have run these all. Mike