Ok, here it goes... I wanna get duals put on my truck this week, i just can't decide on my muffler, or what size i should get with the pipes. I know i want duals out the rear, but i don't want to get to big of sized pipes to rob me of power. Right now im thinking Flowmaster 50 series (quieter than the 40 series), its considerbly cheaper than Magnaflow... but it only comes in certain sized in and outs. Im thinking 3 inch in, 2.5 inch out (anything smaller only has a 2 inch out)... is that to big? I don't want something thats going to rob me of performance, i only have so much with the 3.0 to begin with lol. The tips i want to get only come in 2.5 inch inlet 3 inch outlet, the muffler guy said he could still use um if he welded on a piece to make the pipe bigger, but id perfer to keep it as clean under there as possible. What does everyone think?

 

that is how mine is and i have a 2.3 and i noticed that when i take off from a stop light it shudders some but top end is great 90mph on the interstate no problem and i have stock gears and a 2.8

 

3" in is probably a little too big for a 3.0. I would go for something smaller.

You might want to look at a 40 Series Delta Flow. They are intended to be quieter than regular 40 Series mufflers and come in a fairly wide range of sizes.