Whats the difference in running a si/do muffler and useing a Y-pipe after the si/so mufflers? and what size pipe should i use 2.25 or 2.5? I heard 2.5 would mess my low end torque up but i really dont know that muck about it

 

i had both on my truck and the SI/DO has a more uniform sound from both tailpipes...when i had the SI/SO and the Y-pipe the one pipe sounded a little different than the other..and i dont notice any difference in torque with the 2.5 inch piping

 

i have SI/SO with a 2.5 in pipe and i didnt notice a change in torque

 

[QUOTE=djfllmn;1824943]i had both on my truck and the SI/DO has a more uniform sound from both tailpipes...when i had the SI/SO and the Y-pipe the one pipe sounded a little different than the other..and i dont notice any difference in torque with the 2.5 inch piping[/QUOT

So what do prefer?

 

the SI/DO with the 2.5'' piping

 

i have a 2000 flex 3.0 and get 19 mpg with a thrush welded si/so chamber muffler 2.25 inches. thats going 60 mph. and 16-18 in and around townish, sounds really good and rough/mellow btw... i do take meticulous care of my truck though so that might have something to do with my mpg. also i had a straight through dynomax ultraflow 2" and i lost upper power but got a little noticable lower end tq. not enough for me to keep it though... good luck, these ranger cause a chronic search for perf parts man, its rediculous, i feel like i should just upgrade to a f150 but cant bear losing my little buddy :)