I just don't get this mod. Maybe its just me, but with no performance gains, and still having two exhausts our the rear end, what's the ROI on this? Looks? Wouldn't exhaust tips be a whole ton cheaper? Sound? On this point, I'd be tempted to spring the uber-bucks and source a set of the Maserati mufflers from the euro-spec ecodiesel... he he... THAT would sound stupendous!

 

Then all you need is this little device...................no one will know but you !

 

Hmmm...they have a V12 version as well...though Amazon reviews are totally mixed...

 

Agree I don't get value in this mid. Hundreds or $1000+ to change sound just slightly? I'll spend elsewhere thank you.

 

Up to +13HP and +7lbs. x ft of torque over the stock exhaust system

 

the key words are 'up to.' no real claim of performance gain. 0 would fit the 'up to' category

 

At what RPM? Most advertised hp gains are at an RPM that you never drive at. They have done a lot of testing with cold air intakes to disprove their worth. I looked at getting the "best" on the market for my tj and discovered all the results were at 4000+ RPMs. The 4.0 sounds like she's gonna blow at 3500. At 3000, where I normally shift, it was around a 2 hp gain. Not worth the money IMO

 

X2 exhaust isn't worth you time unless deleting

 

Those gains are BS. Don't believe it. No one will see any gains under normal RPMs. I don't fall for those advertising claims any more ("UP TO 900 HP more...").
In addition, any claim of gains around 20hp and less is within the margin of error for dyno testing. Run a dyno multiple times but only select the best for your advertising.

 

A local shop can do this for way cheaper! They must be smoking some good stuff... My opinion is if anyone wants to make their exhaust a little louder, start by removing the muffler. The resonators will ensure there is no drone. that can be done for $50. Make sure the shop uses clamps since you may not like the sound. Your next best option would be to buy a good muffler and delete the resonators. I know Dynomax makes a muffler that has a spring controlled flap to isolate drone in an exhaust system. I think those mufflers are $100. You'll still be half way in the price of this $530 US kit.

Also increasing the Dia. of the pipe may not be beneficial for our engines. Turbo engines need restriction in the exhaust system to maintain back pressures. I know theirs a lot of people out there that actually play around with the exhaust Dia. Guys will start at the front of the engine with the stock Dia. (lets say 2 1/2") and then in the center of the exhaust system change the piping to 2" dia. then back to 2 1/2". They do this to increase back pressure so that the turbos run a bit more efficient. Some guys swear by this set up but I have never run anything like that. All I know from lessons learned is to never touch exhaust headers!!! They change everything! It takes a lot of work to fine tune your engine after a serious modification like that.

 

Also increasing the Dia. of the pipe may not be beneficial for our engines. Turbo engines need restriction in the exhaust system to maintain back pressures. I know theirs a lot of people out there that actually play around with the exhaust Dia. Guys will start at the front of the engine with the stock Dia. (lets say 2 1/2") and then in the center of the exhaust system change the piping to 2" dia. then back to 2 1/2". They do this to increase back pressure so that the turbos run a bit more efficient. Some guys swear by this set up but I have never run anything like that. All I know from lessons learned is to never touch exhaust headers!!! They change everything! It takes a lot of work to fine tune your engine after a serious modification like that.

This is completely wrong! You want little to NO back pressure on a turbo engine. The turbine will create all the back pressure you need.

 

I'd be more interested in how much an opened up exhaust drops EGT's and improves MPG's, because it will, than the little gains in power.

 

changing anything on the exhaust of these trucks behind the def/dpr will just change the sound a little bit. Nothing else will really be effected.

 

I would like to think differently. I'm new to diesels and this is my first one but wouldn't it be similar to like a cat-back system? Cat's restrict flow but any type of piping that's bigger then stock does help push more through right which means more power?

 

The whole point of a turbo is to move as much air in and back out of the engine as fast as possible

 

Sorry I don't agree. We monitor the back pressure on the race car right before the turbo. Anything more then 1:1 we lose power and the car won't make any boost up top. So 1:1 and under will make power and help the car maintain high numbers of boost.

 

Could you explain what 1:1 means? That's a ratio and without a reference and units, it doesn't mean anything...at least to me. Just trying to understand.

 

If you are running 35psi of boost you will want 35psi of back pressure or lower. It helps the motor run real efficient.

 

Thanks.. that answers that question and also spurs my curiosity, as an engineer, so need to research the physics behind it.

 

I just read that a Garret engineer suggests reducing exhaust back pressure as much as possible. For a given engine there is an optimum exhaust pipe size, but going larger doesn't hurt. The goal is zero exhaust back pressure, which not physically attainable.

 

But with a DPF, isn't the increased flow of an aftermarket muffler negated?

 

That's funny! Cleaver spin - I've heard Ford does something like this on their little hot hatch. It's not for me if its not the real thing - in my opinion, it sounded more like a pissed off weed eater than a V-8.

 

I cut off the stock muffler and put in a straight pipe. Not worth it. The sound difference is so minimal and haven't seen or notice any change in hp or fuel mileage. Not worth touching unless you delete the dpf. Just my opinion!


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While the performance increase may be very minimal, you shed a useless muffler. Even if you gained 5 HP, you would never notice it, unless you dynoed it.

BTW, the more efficient a turbo is the less exhaust noise you will hear. By its nature, a turbo dissipates a lot of energy when it is producing boost and that energy includes heat and sound. The DPF/SCR are good mufflers as well.

My Duramax has a 4" turbo back, straight through, exhaust and it is much quieter than I expected.

 

This is one mod that I probably will do. I would like to see that useless muffler gone and I like the looks of a larger 3.5" pipe. Since my truck has a single exhaust, I think that it will make the truck look a bit better, but I don't expect any noticeable gains in power or mileage.

 

How can I check the exhaust back pressure on my 2016 ED?