I need to get my silencer off, and possibly the pre-muffler. I can't get separate them due to corrosion.
I've tried Plusgas, heat, tapping with a hammer to crack the rust, gently prying the union open with a screwdriver ... and it ain't budging.
Twisting or waggling the end can around just moves the pre-muffler by exactly the same amount.
Short of cutting them apart, any thoughts on what I can try next?
You seem to have covered all the tricks...other than saturating with WD40 or alike and leave standing for a few days chopping may be the only option left if they have fused together with rust.
Time and determination will sort it.
When you run out of both, chop it