The Merlin repackable exhaust silencers have a 6 inch diameter stainless steel main body. They are available in four different lengths and with 3 differing pipe diameters.
Merlin Repackable Racing Silencer 15 Inches Long
Merlin Repackable Racing Silencer 18 Inches Long
Merlin Repackable Racing Silencer 21 Inches Long
Merlin Repackable Racing Silencer 24 Inches Long