Most Expedition / Navigator owners will probably tell you that they selected their vehicle because it was just the right size...not to big, not too small. Of course, having a potent V-8 under the hood was probably another attraction. Still others will tell you that they bought their Expedition / Navigator for the luxury amenities. What's more luxurious than having an excess of power? With MagnaFlow's cat-back performance exhaust system, you get exactly that: excess power. Power to tow big loads...power to carry lots of friends...or that extra freeway merging power you gave up when you switched from a sedan to an SUV. All 4.6 / 5.4L MagnaFlow systems use a large 22" long, 5"x11" polished stainless steel muffler for a smooth, deep tone without intrusion into the cabin. A beefy 4" polished stainless steel tip adds style equal to the vehicles's other luxury appointments.