If I remove the resonator and muffler and placed connecting pipe in those areas will I see an improvement in my performance? It will be clear from the turbo back and according to my cohorts will have a noticeable effect on overall performance. Wanted to check here before doing anything rash. Thanks for taking the time. Doc

 

I took off both of mine and it was so loud running out my 6" stacks I had to put the flow-thru muffler back on...but left everything else off.
I measured the backpressure on the turbo exh outlet and found a significant reduction of pressure and a resulting increase in mileage and general feel of the engine running easier.

 

Pretty much a load of unmitigated woo hoo that will only **** off a lot of innocent bystanders. I went with a 4" MBRP turbo back that works well to reduce the EGT's, which was my primary objective. No noticeable gain in performance according to my SOTP dyno. Still manages to annoy people, only not too badly. YMMV

Cheers All!

Mike

 

There is a huge misconception with certain aftermarket improvements which have people believing that they will gain large HP numbers. Really there is little to no HP gain since the fuel injection system isnt closed loop. The only "real" gain for diesels when changing exhaust or intake is lower EGT's. But.....in saying that, lowering EGT's "allows" for more fueling which in turn will create more HP.

Your truck has a muffler and a resonator. The muffler is the most restrictive, as the resonator is a 4" open free flow design. If you're truly just after lowering EGT's then just remove the muffler. Unfortunately you cant do just that in the driveway as the pipe size between the resonator and muffler is 4" so you'll need a reducer. But if you're after some noise and like the loud diesel sound.....and the in-cab resonating you get with that, then remove them both and straight pipe the stock exhaust. You may like it or you may be shopping for an aftermarket 4" with muffler system. I've had mine straight piped for years. Some day I'll get that 4" system.....

 

I did the 4 inch back exhaust with the muffler mainly because my exhaust needed to be replaced anyway, and the 4 inch was a little bit of an upgrade. I chose to have the muffler on because in my opinion very little HP is lost on a 4 inch exhaust due to the muffler, and I don't have a horrible drone in the cab at highway speeds. I also chose the Stainless exhaust just to prevent future rust and corrosion. Even with my muffler on, I still have to turn the truck off when ordering food through a drive through window. I love the sound of a diesel but I think it's foolish when people destroy a good exhaust system just for the sake of making a truck louder, or spend lots of money on a straight pipe exhaust when their current HP needs would be fine with even a factory exhaust. This however is just my opinion, to each their own.

 

I have to shut her down, and my truck is still running a complete factory exhaust! I am counting the days till it needs to be replaced...

 

Its not the exhaust which is so crazy loud on these trucks. Its the VP injection system. These engines alone make a racket of noise by themselves.

 

Katoom,

Is the VP really that loud? I have heard this stated before but unless you have a way of turning a VP on a machine it would be hard to know for sure. I have helped with a P pump conversion and noticed the engine was a bit quieter, but wasn't quite sure if it was all due to the VP being gone. Interesting point....I'll be sureious to see what I notice when my P pump project is done.

 

Yeah, it is that loud. But dont misunderstand. Its not just the VP. Its the whole injection system.