Here is a picture of an AROSPEED Muffler silencer that comes with some of their 4" tip mufflers.
I have an ATR 3" exhaust that I got from EtremeMotorsports back in early 1996 that has a 4" tip.
The AROSPEED silencer fits perfectly, and quiets my car for street use.
The only modification I had to make to the exhaust was to drill a small hole in the bottom of the tip to put a small bolt through the tip and silencer to secure the silencer to the exhaust.
Questions, email me at: