ORIGINAL: Stuntpilot51
As Cg said the best way is a clean muffler and small zip ties. I've never lost one.
The best fuel and oil remover to use is Westley's bleach white tire cleaner, spray it on, rinse it off, no scrubbing needed. works great on tires too!
Same here stuntpilot. I have never drilled or altered my muffler at all. I just make sure the surface is clean and use some needle nose pliers and pull that zip tie nice and snug. I am going on 3 years with one and the other one is going on 3 year and it was involved in a mid air and stuck in the mud and didn't come off. I am sold on a clean oil free muffler will be good enough.
Joe