MagnaFlow 3 X 4in. Performance Exhaust Pipe Adapter 10764

Installed this adapter on my truck's exhaust system and the 3 x 4 inch size made the transition perfectly smooth. Fit was precise and the stainless steel finish looks like it will hold up for years.

The stainless steel construction feels solid and heavy-duty, and the slip-fit design made welding this adapter into my custom setup a breeze.

Fits perfectly between the 3-inch and 4-inch sections with no leaks, and the stainless steel finish hasn't shown a hint of rust after a month under the truck. Welds are clean and the inside is smooth, so the exhaust note stayed exactly where I wanted it.