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Exhaust packing is Exhaust packing, there are 4 different types. I don’t really for see how it could be deemed illegal exhaust packing.
1.) Continuous Bulk Fiber
4.)Pre-formed glass, or Glass/steel pillows
The pre formed glass will last you the longest, will be the easiest to install, but will also cost the most.
Again I don’t see how exhaust packing can be dubbed illegal, as long as you stay under the DB threshhold (assuming there is one)