Headers anyone? - Jeep Commander Forums: Jeep Commander Forum
Exhaust Questions or advice about exhaust systems? This is the place...

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post #1 of 25 (permalink) Old 08-08-2008, 11:09 PM Thread Starter
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Headers anyone?

Just wondering if anyone knew of headers available for the 3.7L models. K&N Intake, Exhaust, and Jet Chip still dont give me the torque I want with my 32" toyos and lift.
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post #2 of 25 (permalink) Old 08-12-2008, 10:38 AM
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JBA makes headers that fit the 3.7L in our Commanders...they start about $500.00. If you get a set, let us know how they do. Just a lil too rich for my blood.

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post #3 of 25 (permalink) Old 08-12-2008, 10:44 AM
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yes let me know what they are doing for you as well.

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post #4 of 25 (permalink) Old 08-12-2008, 12:09 PM
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I have heard of many people with the 3.7 in the new 4 door JK wrangler. They love the engine for its fuel economy, its quiet, and very dependable. They don't like that no matter what they do to it it won't make the torque they want. The only way they can get the performance offroad they need is to swap gearsets. The lower gear set isn't great for the highway but it does help get that engine to perform. Do you know your gear ratio in the axles?

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post #5 of 25 (permalink) Old 08-12-2008, 01:51 PM
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v6 has 3.07 gears in the axle. what was jeep thinking????

but i digress.

just switch out from 3.07 gears to 3.73 gears. it will be cheaper and more effective then headers on a v6
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post #6 of 25 (permalink) Old 08-12-2008, 02:16 PM
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Quote:
Originally Posted by adamag25
I have heard of many people with the 3.7 in the new 4 door JK wrangler. They love the engine for its fuel economy, its quiet, and very dependable. They don't like that no matter what they do to it it won't make the torque they want. The only way they can get the performance offroad they need is to swap gearsets. The lower gear set isn't great for the highway but it does help get that engine to perform. Do you know your gear ratio in the axles?

The wranglers come with a 3.8 Liter V6 not a 3.7 Liter.




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post #7 of 25 (permalink) Old 08-12-2008, 03:06 PM
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my mistake, despite that I doubt that the .1L will make a huge difference. When it comes to a lift and tires, axle ratio has more to do with torque than engine performance. I agree with 4.7 the gearset swap will be more effective and less costly to get you to have more power to the wheels. For example look at a old wrangler with a 4cyl and 35's on it. The gearset is probably at least a 4.10 or higher.

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post #8 of 25 (permalink) Old 08-12-2008, 03:35 PM
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Quote:
Originally Posted by adamag25
my mistake, despite that I doubt that the .1L will make a huge difference. When it comes to a lift and tires, axle ratio has more to do with torque than engine performance. I agree with 4.7 the gearset swap will be more effective and less costly to get you to have more power to the wheels. For example look at a old wrangler with a 4cyl and 35's on it. The gearset is probably at least a 4.10 or higher.
Not that im purposely trying to correct you but 4.10 gears on a 4 cyl and 35's would be a complete dog. You would need some 4.88's in the axles. Its also a lower gear ratio, just a numerically higher number.




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post #9 of 25 (permalink) Old 08-12-2008, 03:36 PM
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The topic of this thread is headers!!!





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post #10 of 25 (permalink) Old 08-12-2008, 03:39 PM
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Quote:
Originally Posted by 4.7commander
v6 has 3.07 gears in the axle. what was jeep thinking????

but i digress.

just switch out from 3.07 gears to 3.73 gears. it will be cheaper and more effective then headers on a v6
Where do you go to get gears installed that would be cheaper to buy both front and rear 3.73 gears and get them installed for under $500-600 dollars. (The cost of headers).

I also would take gears over headers anyday. Especially if you only have 3.07's. I feel sorry for those guys with lifted commanders and the V6, they got screwed!




2007 4.7 Liter XK | Front OME MD Springs w/Superlift Preload Spacer | Rear 4" Superlift Springs | Bilstein 5125 Rear Shocks | JBA UCA's | Rusty's Rear Adjustable Track Bar | Black Rock 997 Wheels | Fred Goeske 1/4 Inch Wheel Spacers | 305/70R17 Goodyear Wrangler MT/R w/Kevlar | Airflow Snorkel | Flowmaster 40 Series Muffler | Superchips Flashpaq | Mopar Skids | 4xGuard Belly Guard | American Rebel Rear Diff Cover | Rear Powertrax No-Slip | Front E-Locker | Rear Heat/AC Delete

Last edited by 07JeepXK; 08-12-2008 at 03:48 PM.
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