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Old 12-08-2009, 06:42 PM
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Can they make custom headers for a 4.7?

The guy at the shop yesterday when I had my muffler installed said he could do a custom exhaust including headers for like 1200 which suprised me. He said one of his buddies knows someone who does custom headers. It seems like a good price for a custom set of duals and headers but he's not a Jeep guy so im guessing hes not too familiar with how hard it is to make headers and run pipes under the WK. I wouldnt mind throwing some headers on and custom duals if I would see some major gains in HP but it seems it might be too much for such a small engine.
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Old 12-08-2009, 06:46 PM
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Re: Can they make custom headers for a 4.7?

I'm confused... are you asking if it's possible (thread title), or are you saying that you're going to get them done (thread body)...
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Old 12-08-2009, 06:49 PM
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Re: Can they make custom headers for a 4.7?

I was told the same thing by my exhaust guy till he got it up on the lift.....
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Old 12-08-2009, 06:51 PM
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Re: Can they make custom headers for a 4.7?

No im asking how realistic that exhaust and price sounds. I just had a Magnaflow thrown on. The price seems a little low I think he might have underestimated the work needed to make custom headers and duals for a 4.7 WK, I only know of a handful of people who have ever attempted either.
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2005 WK Laredo 4.7 28x.
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Installed: K&N Intake, Magnaflow 18", 245/65/17 Bridgestone Dueler A/T's, Shorty Antenna.
Coming soon: 180 degree thermostat, superchip
Future mods: SRT8 wheels, MyGIG or REC, HID's, Painted door trim and door handles.
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Old 12-08-2009, 06:55 PM
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Re: Can they make custom headers for a 4.7?

Did he specify what kind of design? What diameter primary's? collector size? Material of the piping? Thickness of the flanges? Get these important details before you just fork over the cash. Frankly 1200 sounds cheap for a full exhaust.

I havent crawled under a 4.7 WK but I do know that a 4.7 WJ is VERY cramped. I couldn't even get my exhaust guy to fab up a new downpipe for me (we instead welded in some metallic cats and opened up the Y-merge to 3") . I know on the WK the Y pipe is supposedly different/better (how I am not sure) but I wouldn't expect the WK engine bay to allow much room for headers in the midst of other stuff.

The stock exhaust manifolds actually flow very well, at any rate. Be best off hacking up the Y pipe to weld in a X or H, doing duals and having both sides exit on the passenger side (assuming no room to do a equal length pipe on the drivers side) .
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Old 12-08-2009, 07:00 PM
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Re: Can they make custom headers for a 4.7?

Quote:
Originally Posted by Sleepy4.7 View Post
Did he specify what kind of design? What diameter primary's? collector size? Material of the piping? Thickness of the flanges? Get these important details before you just fork over the cash. Frankly 1200 sounds cheap for a full exhaust.

I havent crawled under a 4.7 WK but I do know that a 4.7 WJ is VERY cramped. I couldn't even get my exhaust guy to fab up a new downpipe for me (we instead welded in some metallic cats and opened up the Y-merge to 3") . I know on the WK the Y pipe is supposedly different/better (how I am not sure) but I wouldn't expect the WK engine bay to allow much room for headers in the midst of other stuff.

The stock exhaust manifolds actually flow very well, at any rate. Be best off hacking up the Y pipe to weld in a X or H, doing duals and having both sides exit on the passenger side (assuming no room to do a equal length pipe on the drivers side) .
Yeah I would like duals and and an X pipe but i'd only run duals if I could run them out opposite side for the look otherwise i dont think the power gains would be worth all that money.
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Old 12-08-2009, 07:05 PM
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Re: Can they make custom headers for a 4.7?

Quote:
Originally Posted by 05quadratrac View Post
Yeah I would like duals and and an X pipe but i'd only run duals if I could run them out opposite side for the look otherwise i dont think the power gains would be worth all that money.

The gains would be worth it.....Same deal with a very free flow 3" single
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Old 12-08-2009, 07:10 PM
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Re: Can they make custom headers for a 4.7?

Quote:
Originally Posted by Sleepy4.7 View Post
The gains would be worth it.....Same deal with a very free flow 3" single
Yeah I should have seen about having a 3in single ran but im low on cash and im pretty happy with the sound im getting now. I just plan to add a superchip and 180 t-stat then Im done with power mods since thats about all I can do without opening the engine. I need to work on some wheels and door trim soon.
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2005 WK Laredo 4.7 28x.
PAID OFF. :D
Installed: K&N Intake, Magnaflow 18", 245/65/17 Bridgestone Dueler A/T's, Shorty Antenna.
Coming soon: 180 degree thermostat, superchip
Future mods: SRT8 wheels, MyGIG or REC, HID's, Painted door trim and door handles.
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Old 12-08-2009, 07:26 PM
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Re: Can they make custom headers for a 4.7?

Quote:
Originally Posted by 05quadratrac View Post
Ye. I just plan to add a superchip and 180 t-stat then Im done with power mods since thats about all I can do without opening the engine.
Not true...........
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