U shouldn't need to???

I dont think I did on mine.. cant remember.
The knock sensor sense the engine knocking BUT due to shitty cams in rattly CVH engines it can interpert (sp) cam noise as knock and retard the igniton.

The bubble wrap because u need to insulate it from vibration.

If u run a bar of boost on a std cooler it WILL retard in the summer anyway.

J