97 f150 4x4 5.4l question
 

I am looking to install dual exhaust on my truck. the problem i am having is the company i am ordering it from is offering me the choice between 2.25 inch and 2.50 inch exhaust pipes. i have no idea which would perform and sound better. they are also offering me the choice between flowmaster 40, 44, and i think super 40 series and mangaflow. can anyone please give me their feedback on what setup they believe would perform and sound better. by the way, the place i am ordering it from is called truckexhaustkit.com and they are running a special right now for anywhere between 199 and 229 for the complete kit. and that is for manderal bend pipes, not the wrinkle bend. any help would be greatly appreciated. thanks in advance.

the choice is all yours. If you want less back pressure go with bigger diameter pipes.