Everyone that's having problems with the saito mufflers need to go to the Horizon Hobby website and file a complaint . They have a "Contact" site you can click on and you can email them with your complaint. It won't cost you anything and you might actually get a free muffler out of the deal. They will never correct the problem until they get enough complaints about it and hopefully they will fix the problem, maybe with a one-piece muffler with a built in tappet! Right now they're getting more rich off of us buying replacements, and yes, they are expensive! Just a thought.

John