I have two S.T.2300's and I have converted both over to the Perry/pump/carb 5001 setup. I get good results on my pattern plane running a Mac's Quite pipe. OS F plug 15% Ritches brew ($10gal in Tx). The other one is setup in a Cap with a bisson muffler. I will run these till they cant be repaired or sold.......then get a kick ass O.S. 1.6.