i have a 2005 F-150 with the 5.4L and i'm stuck decding on a muffler. I want something loud when i get on it, but not drone out when im driving on the highway. On my '99 i have staight pipes dumped under the bed, and thats cool when im by myself, but if i have my girl in my truck we basically have to yell to hear each other. Any ideas on a muffler with the best of both worlds? Thanks, -Connor

 

Magnaflow 14" si/do part #12198

 

x2, I have that same SI/DO system, sounds great when throttle down, but has a nice, non-obtrusive idle. I am actually putting a new system on my truck, where do you live?
-Mick

 

magnaflow. i got the si/so, i should of went with the si/do, but i still love it.

 

i live in Austin, TX