i bought some pipe the other day, i am thinking about straight piping it, i have directions on how one guy did it by taking the last half of the system off and cutting half the muffler away, etc.

have any of you done the delete by leaving the system on the truck, and if so was it a pain to fart around under there?

will the noise in the cab be louder?

thanks guys, i may try this mod tommorow, but for some reason i am having second thoughts on it, dont know why.

 

Im not sure about regular pipe. I used Stainless flex pipe. Im a young kid so its easy for me to move around under there. The tire was pretty much the only thing that got in my way. The only noticable difference in sound in the cab (I think) Is when you step on it, it sounds more like a big block. Not much louder inside. Outside is a different story! It sounds amazing! Youll find youself going down town with your windows down and the heat blasting just so you can hear the turbo and a grin from ear to ear. Good luck on the instal if you diside to do it!

 

I didn't notice any noise in the cab. But you definetly hear it when you have the passenger side windows down....especially when your next to a wall

 

Yeah, do something like KrenzyRyan did. No need to take the whole tailpipe section off unless you just feel like it, then you won't be sure it is lining up. Cut muffler, weld in pipe or flex it, weld hangars on. Start smiling.

 

well i think i might try it then, my SES light wont come on by doing this cause the computer is picking up no backpressure or anything like that will it?

krenzyryan- how long of a pipe did you use, i have a 3 ft piece, i like how yours lines up really well, it looks like you cut more than just the muffler out, am i right

 

What writeup are you using? You can cut the muffler off as close as you can get to the body? The section just forward of the muffler can be removed, grind off the locating pin (you will see what I am talking about when you look), rotate the pipe 180*, that will make up for the offset from the muffler, then line up the replacement pipe and weld or you can even clamp it with a band clamp if you do it right. Have a look. Work smarter, not harder.

 

thanks tenn01 i think that definatley sounds easier, i was using this guys from http://www.forgotton.net/frame.html its under the 350 section where the girl is bouncing, butif you dont want to look here is what it said.

The stock muffler on the Ford Powerstroke is a VERY restrictive system. If you cannot afford a
brand new 409 Stainless turbo back exhaust system, but you want to reduce backpressure and
lower exhaust temps at the turbo, then the Straight Pipe mod may be for you.


There are a couple of ways of doing this mod. On the 94-97 powerstrokes, the muffler is a straight
through design where the inlet and outlet are "In Line" with each other. Simply cut the old muffler
out and weld a piece of 3.5" aluminized steel pipe in its place.


The 99+ powerstrokes however use an "Offset" muffler. Because of this, you cannot simply weld in a
straight pipe. The way I describe needs minor mechanic skills, a Sawz-All type saw, and a welder.


First, remove the muffler and tailpipe from the truck. Simply under the U-clamp just ahead of the
muffler and work the pipe out of the flange. (This can be more difficult than it sounds if the pipe
is heavily rusted/seized. Remove the exhaust hangars from the rubber grommets and work the tailpipe
out the back of the truck. You may want to jack the Body/frame of the truck up and let the rear axle
weight hang. This will open up a huge amount of room between the axle and body to get the pipe in and out.


Using the Saw-z-All, carefully skin open one side of the muffler to gain access to the inside. Once inside,
cut the two perforated metal tubes out completely. Try to make it a clean cut, and leave youself some
material to weld your new pipe in. Slash-cut your replacement 3.5" pipe so that it fits snugly bewteen
the inlet and outlet of the muffler casing. Tack-weld your straight pipe into place firmly.


Flip the muffler case over and finish skinning the muffler casing off. The reason for only skinning half
the muffler at a time is so that none of the exhaust hangers or tailpipe geometries get messed up. Once
you tack in the new pipe, it will hold everything in place so that you can finish removing the muffler
casing. Final weld your straight pipe on all sides and reinstall opposite of removal. Everything should
line up exactly if you did it right, and your tailpipe should point slightly down or straight out.


You will notice a slightly louder sound level in the cab, but I used a DB meter and it was only a slight
increase. Outside the truck however is a marked increase in sound levels. You will also hear a pronouced
"Turbo Flutter" sound as the exhaust gases pulse across the turbo vanes. Some describe the sound of a
straight piped truck like the sound of a "Big Cam Bigblock motor" when you really romp on the throttle.

 

Hey, that doesn't sound too bad either, except all the skinning and cutting. The method I referred to involved no removal of the system, especially if you use band clamps or flex pipe. Let us know how you proceed.

 

I will have to measure it when I get off work, ill let you know the dimensions when I take them. Yeah, I cut more than just the muffler, to the point where it would flow better/straighter. Ill take some pics. It took me less than an hour to do.

 

thats ok krenzy, all i got is 3ft so i will have to work with what i got, yours looks good

 

Well, what do you know. There's that funky looking driveshaft extension again. Could they have made that any smaller??

 

yeah i was wondering about that thing to, looks like it shouldnt be able to handle the torque

 

I've seen it before on here. Mine looks nothing like that. Apparantly it is just fine because I don't remember any posts here on it failing and no TSBs to my knowledge. Just doesn't look like it belongs there on our trucks. Looks like a front axle shaft from an old army jeep.

 

yeah mines got a big weight or something right on the end and is full length, would that only be on the 3/4's?

 

Can't explain it. Mine's a 350 and doesn't have it. His is also a 350???? Both CCs.