2.25 inches (≈57 mm) inlet.
Yoshimura’s current mufflers (including the RS5 series) use a standard 2.25″ inlet. Older RS3 mufflers used a smaller 2.0″ inlet, but that was updated. The CRRS5126CR is a universal-style replacement/round-outlet RS5 muffler can (not a complete bike-specific slip-on), so it is designed to slip over a 2.25″ OD exhaust pipe/mid-pipe
Exact fit can still depend on the specific mid-pipe, clamp, and any adapter needed for your bike—confirm with Yoshimura or measure your pipe if you’re unsure.
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