You might like the "Turbo Tones" from Stainless Specialties. It's what I put on mine (ceramic coated though for me).
"Our original 100%, 304 stainless steel chambered muffler, now in a more conservative sound. Available in 3.5" or 4" body diameters. Any inlet/outlet size." You can hear mine below -- I would describe the sound from my FE through those pipes as "agressively mellow."
... Here's the SS website:
Stainless Steel exhaust components•