Honestly bud...I have a 94 F250 with a 5.8....I didn't want to cut the cat off due to the "awesome" emissions here on Long Island NY. So I junked the muffler and did a "Y" after the cat and I have duals coming out on an angle behind the tires. Honestly when I am just driving there is no cab noise and there is just a nice rumble. But as soon as I get my foot into it from a stop you can def. hear it coming haha.

Just my .02 cents here