This reminds me, my Z28 has one of these. I replaced the SLP Loadmouth bullet "muffler" with one. The SLP muffler isn't really a muffler at all. It's just a piece of expanded steel pipe. This Moroso Spiral Flow made a huge difference in sound (much better and a lot less loud) without a noticeable difference in power.
I was going to put this 3" on my 6.2, but can't see cutting a 3.5" exhaust down to a 3" muffler.
1969 Chevy RCLB C10 350/TH400 SOLD
2007 Chevy RCSB 4.8 4x4 LS SOLD
2008 Chevy RCSB 5.3 4x4 LT SOLD
2010 Chevy CCSB 6.2 4x4 LT SOLD
2005 GMC CCLB DRW 6.6 Duramax 4x4 191,000 and counting
2013 FORD CCSB F350 6.7 Powerstroke 4x4