Advance Auto Parts has the Walker 22266 Quiet-Flow SS Stainless Steel Direct-Fit Muffler for $41 - $50 rebate [Exp 5/31] + $10 shipping = $1 shipped. Normally found for $30+ on the web. Designed to quiet down generators after attaching directly onto the hose. Or take $40 off an order of $115+ with code DOW16 [Exp 4/20] and get free shipping (on orders $75+), then get $50 off with the rebate. Thanks, Culliganmandan!