This is a Silicone Exhaust Coupler for the HPI Savage X. This coupler connects the manifold to the tuned pipe.
One black silicone coupler
Nothing. This is a direct replacement part.
Length: 40.30mm (1.59")
Outer diameter: 24.25mm (0.95")
Inner diameter: 15mm (0.59")
The couplers have convenient grooves molded into the outside of the silicone to hold the tie straps.