Pretty low HP numbers(G660 lower Hp than a Ms400c) and notice the test figures include the use of a catalyst muffler.I hope my above post is fairly clear and you can see the 4 engines of 35.2, 76.5, 91.6 and 121.6 cc.
That is, Holzfforma G111, G466, G660, G888.
None of these are EPA compliant.