Factory exhaust issues
I have a 08 4x4 crew cab with the 4.6. It still has factory exhaust on it but it's not quiet at all. It has a raspy rumble to it rather than a clean sound. In all honesty it sounds like a clunker. I've checked for leaks and didn't find any. Can anyone tell me what's going on?
Magnaflow will probably be the best for you. They have an 18" and22" that are not too loud, both. In SI/SO or SI/DO. The 22" will be a very quiet idle, with just a low sound on acceleration. The 18" will give you a nice low rumble at idle, and a very nice sound on acceleration.

