[Aussie Mike]

I agree Bob,

The cat is physically inside the body of the side pipe. The tube used for the main muffler body is 4.5" and there is a small airgap between the outside of the cat and the inside of the muffler body. I'm hoping this will reduce some of the radiated heat. I think I'll play it safe and space the whole pipe a bit further from the paintwork too.

Cheers