Ok, it's decision time. I like the sound of both but performance matters most. I don't care which costs more and I need to get things going as I have an appointment next Sat. to do the exhaust. This is for a '01 F250 SD 5.4. Thank you for any advice.

 

I love the Force II. Best of both worlds. Stay out of it and it has a nice mellow rumble. Get into it and it sounds really, really good. At 70-80mph it's quiet. No drone in the cabin. Good mid range and upper end increase in power/torque. Hope this helps.