Cyberwolf,it's not you; it's all thier big engine mufflers. I got a Moki 1.8/Bisson pitts muffler. Well it was suggested I plug up one the tubes to get more tank pressure. All I can say, I wish RCU was around when I bought 90% of the stuff I got 'cause it would still be on thier shelves due to the aggravation factor.