Hello,

I am thinking about buying the Flowmaster cat-back kit for my 02 Navigator. The kit I am considering includes the 50-Series "SUV" muffler.

Questions:

I've read that the 5.4 liter motor tends to cause a "drone" at ~2000 RPM, resulting in an interior drone at crusing speeds. Does the Flowmaster kit cause ANY interior drone or ANY increased noise at the interior during part-throttle/crusing speeds?

I don't mind increased sound levels outside and under acceration or WOT, but I am only willing to tolerate a very small amount of increased noise at cruising speeds. What are your experiences with the Flowmaster kit?

I know there are other makes such as Gibson, Borla, Dynomax, etc. I would like to consider the Flowmaster system first.

Thanks,
JAMES.

 

I have a friend with the Gibson cat back system on his 4.6 Expy. It sounds pretty good. A little louder than stock, but not too loud. It has no interior drone either.