So , I ordered the SI/DO Super 44 for my 04 (new body) supercrew 4x4. In preperation for it, I took the old exhaust off in front of big can and removed whole thing from truck. So I was patiently waiting for the new muffler to come in and take to shop to have them run new pipes and install.
Long story short, battery died in car, and had to take truck to store. Afraid of getting noise ticket, I started truck and after cold start, it idled down and could barely tell it was without a muffler. Went to store and it was a nice midtone exhaust sound. Didint sound like a truck with no muffler at all...Kinda like a magnaflow loud sound.
So now Im confused,,,,why is it so mild sounding? I know i have 4 cats,,,but still. It is no louder that all the mustangs i have had with aftermarket exhausts.
If I wanted to go a few months and not put on the new muffler (to save up a few dollars on the install) will this be ok for the truck? Am i losing backpressure/HP/Torque by not haveing the muffler at all?
It honestly sounds so good like it is that I wish I wouldnt have bought the muffler and just put a turn down on it where it is.
Help

 

Its because of the 4 cats, and the 2.5" exhaust with the 2.5" Y pipe. All 4 combines really quiet the exhausts. Thats why you can never hear the idle or damn near anything past 2000rpm out the tailpipe. Hopefully your Super 44 is a 3" in 2.5" dual out, that way you can have the shop chop the Y pipe outlet and mate 3" to it and run it straight to the muffler, that will open up some sound and flow better. But the cat set-up is what keeps you quiet.

You are suffering performance and gas mileage by running no exhaust, i'm actually surprized you haven't noticed it yet.

 

I'm with you, I am also surprised he hasn't noticed haha.

 

I just drove it to the store that night (about 1 mile each way and it is 35 mph zone. So that is probably why. Muffler should be in this week (ordered last Fri).
Can you elaborate Darren WS6 when you say:

"that way you can have the shop chop the Y pipe outlet and mate 3" to it and run it straight to the muffler"

It is a 3" in, dual 2.5" out. I see where the 2 cat pipes come into each other and go into the 2.5" pipe that runs to the muffler. Are you talking about cutting that 2.5" pipe off as close as I can to that connection where they join and putting a 2.5"-3" connector on there and running the 3" straight back? If so, that is the plan. If you meant something else, please let me know.
Thanks for input guys.

 

Pretty much. I'm actually saying chop off the outlet on the Y pipe connector and have 3" inserted and welded and ran straight & un-bent to the muffler inlet. 2.5" single exhaust is too restrictive and running into a 3" muffler inlet isnt making it any better. Run entire 3" from the Y to the muffler if possible.