There are two different rear diffusers - one for LS/LT and one for SS. The SS one dips down more in the middle and does a better job of hiding the mufflers but not completely.
I'll be painting mine satin black. I've used this stuff before on my '56 Chevy exhaust to basically hide the pipes so the 24" chrome tips stood out more. Worked out fine for me.
http://www.eastwoodco.com/shopping/p...iProductID=741
Once I can find the extra money, I'll probably pull the rear diffuser off and have it painted gloss black to make it look a bit nicer. I won't paint it a matching Victory Red because I like the contrast it provides on the rear.