JT aftermarket exhausts hardly seem worth it.

[digitalwiz]

I took a look at some of the available systems and was a bit surprised to see that most don’t even post dyno gains. The ones that do claim increases say “up to 5 hp and 5 tq. Seems like a huge waste of $$ to me.

anyone get better increases from a cat back system?

am I missing something here?

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[mike921921]

I took a look at some of the available systems and was a bit surprised to see that most don’t even post dyno gains. The ones that do claim increases say “up to 5 hp and 5 tq. Seems like a huge waste of $$ to me.

anyone get better increases from a cat back system?

am I missing something here?

Up to 5hp - sounds like a CAI 'benefit' ?

 

[ScottBeach]

Im old. Back in the day (1980s) you could throw on a free flowing exhaust and add a lot of power. Oems really have it covered now. Unless you want it for sound i dont see the point of aftermarket exhaust today

 

[CerOf]

https://www.awe-tuning.com/make/jeep/jeep-gladiator-exhaust-suite

They state 5hp and 10 torque at the wheels.
AWE is top notch.

 

[Mr._Bill]

If I were to put one on, I would go with AWE. With the computer controlled engines, intake and exhaust improvements offer little verifiable gain. The bulk of the change is in the sound produced.

 

[Dqban]

any real exhaust system comes with new ECU mapping. Its just for looks otherwise.

 

[RavensEyeOffroad]

To be honest I think the whole topic needs thrown out and re-examined.
To think
1. that this engine is putting out all the power its ever going to and they tweaked it the best they could from the factory is silly. They build them to hit their power and mpg marks at x budget, its that simple. Give this motor to some race shop and say "no turbo, no supercharger and no NOS, tune it, intake manifold, exhaust manifold etc see what you get." I bet they could find more horse power but at the cost of either mpg or longevity.

2. its also silly to think we can toss an intake and an exhaust on and get 20+ hp. The intake and exhaust isnt the bulk of the issue (sure they could be improved) but really its all about the tuning and fuel maps and all that sort of stuff.

To sum it up, it runs like it does because they have metrics to hit and a budget to do it with. And I know its coming "you dont think if they could add 20 horsepower they would not have done it?" No not at the cost of X mpg, drivetrain durability or cooling capacity. You cant get something for nothing.

 

[digitalwiz]

I think you are right about trade offs. Some of these exhaust systems are $1600 so it didn’t make sense that all you were buying 5 hp and torque

 

[kevman65]

If you're going to go, you have to go the full route.

With a CAI, less restrictive exhaust AND the correct tuner, you can see gains in HP, Torque, and MPG.

You're looking at about a $2000 investment for low percentage gains.

Just a CAI, or just an exhaust, you're looking at seat of the pants dyno thinking you got mo` power, *GRUNT*

 

[ScottBeach]

It's all relative. Pre computer and back in carb days. Intake and exhaust could net 25% torque gains. The fight for mpg had just begun and all other needs were secondary to mpg/emissions. Just saying today it takes a lot more than new pipe to get any gains. For a jeep its a lot cheaper to just regear than try to find more torque.

 

[Kevin_D]

To increase power, you need to consume more fuel. You can increase volumetric efficiency (the ability of the motor to breathe,) and see some improvement, but you need to alter the fueling to get more power.

Kevin

 

[ACAD_Cowboy]

So i just put an "axle back" kit on my JkU and to be honest the pentastar sounds wretched. I ended up adding a muffler back into the system to avoid the gassy subaru sounds of "American Thunder".

As to why? I needed to make space for a rear mounted winch and eliminating the factory can is required to make it fly.

As to gains? I feel it's the same gains you get from male enhancement pills and hair thickeners. Honestly for all the bark and snort its still just as slow as it ever was. What I lost in weight I feel I also lost in back pressure, yeah yeah high rpm scavenging and all that noise; these engines are producing an extremely high quotent of peak potential power as it is, the investment required to wring that last Nth of power out ain't worth it, just ask litebrite.

 

[Riccochet]

In the era of throttle by wire and sensors controlling everything, if you aren't tuning for your mods you aren't really going to see much improvement.

An unlocked ECU and tuner should be the first thing anyone buys that is interested in performance gains on modern engines.

 

[yoda13]

The only reason I would consider the AWE is for the trail version. I think I’m just going to cut off that last resonator by the tailpipe and put a turndown on the end of it and be done.

 

[smlobx]

To be honest I think the whole topic needs thrown out and re-examined.
To think
1. that this engine is putting out all the power its ever going to and they tweaked it the best they could from the factory is silly. They build them to hit their power and mpg marks at x budget, its that simple. Give this motor to some race shop and say "no turbo, no supercharger and no NOS, tune it, intake manifold, exhaust manifold etc see what you get." I bet they could find more horse power but at the cost of either mpg or longevity.

2. its also silly to think we can toss an intake and an exhaust on and get 20+ hp. The intake and exhaust isnt the bulk of the issue (sure they could be improved) but really its all about the tuning and fuel maps and all that sort of stuff.

To sum it up, it runs like it does because they have metrics to hit and a budget to do it with. And I know its coming "you dont think if they could add 20 horsepower they would not have done it?" No not at the cost of X mpg, drivetrain durability or cooling capacity. You cant get something for nothing.

However the same engine in the Dodge Challenger puts out 303HP and 268 #/ft of torque so why can’t we have the same in the Glad…

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