What is the best exchaust plus intakr combo - Jeep Commander Forums: Jeep Commander Forum
Exhaust Questions or advice about exhaust systems? This is the place...

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post #1 of 14 (permalink) Old 05-24-2016, 06:34 PM Thread Starter
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What is the best exchaust plus intakr combo

Trying to figure out what is the best combination of exchaust upgrade and cold air intake for a 4.7L the would give a good combo of power and fuel efficiency
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post #2 of 14 (permalink) Old 05-25-2016, 06:43 PM
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For the money? Or budget be damned and I need the best of the best?

What maintenance has been done?

Many people want to do "upgrades" on a 100k mile vehicle and completely overlook the fact that it is far overdue on basic maintenance items that woiuld significantly improve performance or efficiency for less money. The problem is that it isnt as sexy to put in new plugs and clean the throttle body and replace the fuel filter as it is to put in a $300 intake that likely does nothing.

Last edited by luckyse7ens; 05-25-2016 at 06:46 PM.
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post #3 of 14 (permalink) Old 05-25-2016, 08:50 PM Thread Starter
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Join Date: Apr 2015
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All maintenance has been performed on this vehicle. Filter spark plugs fuel injection cleaning filter change.All services have been performed on time. 86,000 miles.
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post #4 of 14 (permalink) Old 05-26-2016, 02:03 AM
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All maintenance has been performed on this vehicle. Filter spark plugs fuel injection cleaning filter change.All services have been performed on time. 86,000 miles.
I have already bought this cat-back exhaust system & this cold air intake.

Exhaust Systems Cat-Back MACH Force-Xp 3" Cat-Back Stainless Steel Exhaust System w/Polished Tip; Jeep Commander 06-09 V8-4.7L (XK) (2WD & 4WD) 49-48052 - aFe Power

http://www.carid.com/afe-power/stage...-54-12602.html

I should pick up 20-30 hp between these 2 upgrades (and probably a couple of mpg's) which will put me in the HP range of a stock Hemi.

I will have it all installed in July when I arrive back conus.


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Last edited by Big Blue; 05-26-2016 at 02:54 AM.
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post #5 of 14 (permalink) Old 05-26-2016, 07:30 AM Thread Starter
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Join Date: Apr 2015
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Thanks for the info and thank you for your service. I retired from the Army in 2003.
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post #6 of 14 (permalink) Old 05-26-2016, 01:43 PM
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I don't know the actual figures for different mods, modding Commanders for more power doesn't seem to be common enough that is any real good comparison of the different mods.


I'd suspect the Tuner Devices, that program different performance into the PCM, might be a your best power gain. And its cheaper. Purely a guess on my part, and I would believe someone who has tried the different mods and can advise you better. But I'd suspect the tuner device would produce more power than the CAI and CAT Back Exhaust.


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post #7 of 14 (permalink) Old 05-26-2016, 03:18 PM
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Quote:
Originally Posted by Big Blue View Post
I have already bought this cat-back exhaust system & this cold air intake.

Exhaust Systems Cat-Back MACH Force-Xp 3" Cat-Back Stainless Steel Exhaust System w/Polished Tip; Jeep Commander 06-09 V8-4.7L (XK) (2WD & 4WD) 49-48052 - aFe Power

http://www.carid.com/afe-power/stage...-54-12602.html

I should pick up 20-30 hp between these 2 upgrades (and probably a couple of mpg's) which will put me in the HP range of a stock Hemi.

I will have it all installed in July when I arrive back conus.
30hp might be overly generous from a catback and intake on an otherwise stock 4.7L. Maybe if the tune were adjusted to take advantage of it.

Jeep Grand Cherokee Upgrades - Mo-Power For Our Mopar - 4-Wheel & Off-Road Magazine
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post #8 of 14 (permalink) Old 05-27-2016, 07:08 AM
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Originally Posted by luckyse7ens View Post
30hp might be overly generous from a catback and intake on an otherwise stock 4.7L. Maybe if the tune were adjusted to take advantage of it.

Jeep Grand Cherokee Upgrades - Mo-Power For Our Mopar - 4-Wheel & Off-Road Magazine
The factory that manufactures these items did dyno testing with these modifications and the numbers I'm quoting is what they say they have documented in their dyno tests.

20 hp is on the conservative side, 30 hp is probably with optimal tuning.

Realistically, it will probably fall somewhere in between.

If I pick up 20-25hp and an extra MPG or two with the improved airflow & exhaust, it will be money well spent.

IMO, that's a realistic expectation with these 2 mods installed from what I have researched and read.


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Last edited by Big Blue; 05-27-2016 at 07:49 AM.
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post #9 of 14 (permalink) Old 05-27-2016, 07:26 AM
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Thanks for the info and thank you for your service. I retired from the Army in 2003.
My pleasure. Thank you for your service as well.


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post #10 of 14 (permalink) Old 05-27-2016, 12:33 PM
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Join Date: Apr 2014
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Quote:
Originally Posted by Big Blue View Post
The factory that manufactures these items did dyno testing with these modifications and the numbers I'm quoting is what they say they have documented in their dyno tests.

20 hp is on the conservative side, 30 hp is probably with optimal tuning.

Realistically, it will probably fall somewhere in between.

If I pick up 20-25hp and an extra MPG or two with the improved airflow & exhaust, it will be money well spent.

IMO, that's a realistic expectation with these 2 mods installed from what I have researched and read.
Yeah, I typically don't trust manufacturer claims. They have a vested interest in making those numbers look better, they certainly show best case scenario at the least. I could see around 20 @ peak though.

According to Hypertech my tune on an otherwise stock vehicle gets me +25 HP with a 3.7L! Its @ nearly 6k rpms though. It sure as hell doesnt feel like it has almost 25% more power haha

http://www.hypertech.com/Performance...Gear_52501.pdf
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