4.5" 110mm adjustable slip in rear muffler siliencer.

the silencer has a 110mm outside diameter and slips into your muffler and then you need a hole to bolt it in.

The silencer can then we adjusted to open or close the "petal" design.

So if you need to quieten down the exhaust on your car if it has a 4.5" exhaust tip it is very easy to do.