question for you exhaust pros
as you probably know, im running dual flowmasters. im thinking about putting my original muffler back on b/c its starting to get a little annoying and i want my truck to be quite again.
so, my question is, if i put my stock muffler on, ill have to find a y pipe to attach to the back of it so i can keep my duals. will i loose any power or back pressure by switching to the original and adding the y pipe?