I remember as a kid when we used to take a stk muffler and ram a bar through the center untill we had a straight through hole then stick it back on the car so we sounded cool. Having never looked at my CTD muffler would I be able to do the same thing.thereby not having to take to a shop to have a pipe added.

My second muffler question is. When you go with open exaust on a gas motor you lose horsepower in the lower powerband range because of the loss of back pressure but when you start to increase air intake and raise compression you can open exaust more to increase H.P. espessially by cutting to length to produce tuned exaust for a particular powerband (rpm) range. Does the same principals apply to the CTD or do you apply a different principal because of the compression?? ???

 

Well, other than just the higher compression of a diesel, it's also got a turbocharger on it. That has to have some sort of effect on any backpressure that might be present. At any rate, my understanding is that opening the exhaust on these motors doesn't have the effect that you're talking about on gassers. I'm sure someone will correct me if I'm wrong, though.

 

Our diesels act differently mostly because of being turbo charged. In this case, the turbo applies some back pressure to the engine. You can go to a larger turbine (exhaust) housing, which will let the engine breath better, but will also cause more turbo lag.

It is generally considered best to open up the exhaust as much as practical. This will help the turbo spool a little quicker. Also reduces exhaust temperature somewhat.
Many run with no muffler at all. Others prefer a straight-through performance muffler. Somewhere around 350hp or so, you may want to go to a 4" diameter system.

 

I think the muffler on a CTD is built a little too tough for that trick. Never hurts to try, though.
You won't lose bottom end by straight piping a turbo diesel. The more pressure drop there is across the turbine, the faster the turbine will spin. By removing the backpressure caused by the muffler and/or cat, you increase the pressure drop, which gives you faster spool up (actually helping bottom end power) and more boost. The added airflow helps keep EGT down, too. The most important thing is that it sounds beautiful. 8)

 

Back pressure is bad JUJU on a diesel . You wont loose any hp by whacking that thing off and your truck will probably run better if you go ahead and pull the catalitic converter off as well, due to the fact that it is most likely plugged.
Im not sure about stickin a bar through through the muff to open it up but you can clean out the cat. with the "bar" method.
Scott

 

[quote author=dsljunkie link=board=7;threadid=21756;start=0#msg203763 date=1067561249]
Back pressure is bad JUJU on a diesel . You wont loose any hp by whacking that thing off and your truck will probably run better if you go ahead and pull the catalitic converter off as well, due to the fact that it is most likely plugged.
Im not sure about stickin a bar through through the muff to open it up but you can clean out the cat. with the "bar" method.
Scott
[/quote]

2001 didn't come with a CAT. Go ahead and remove the resonator along with the muffler (the little muffler in front of the big muffler).
I didn't but wish I would have.
Not going to bother now, as next exhaust mod will be a 4inch all the way.

phox