[ollykiwi3]

thanks Dan EC
wondered if that was the case with ERA floors. My mufflers are Edelbroch SDT, chambered with no packing. they sound good, not too loud and quite throaty. centre inlet, offset outlet. my mufflers only hang below the rails about 1/2", so you hardly notice them. consequently, they are close to the floor pan as stated.
I will look into something like the lizard skin as a secondary measure. I have the ACL shield in place above the muffler, although it is mounted 2mm below the floor for an air gap, which leaves about 6-10mm between muffler and heat shield. how far from the floor pan is the top of your muffler??
cheers