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Exhaust upgrades       #: 206
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 Posted: Mon Nov 20th, 2017 07:35 am
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Eddie Money
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I have a 2007 4x4 4 door sport 4.0L. I'm looking into headers and dual exhaust. It's originally a California car but no longer resides there. I still have to pass an emission test every other year. My first question is will adding headers and dual exhaust affect an emission test? My next question is will I need to use a tuner to run headers and dual exhaust or will the stock computer handle the changes? My last question till I know the answers to these, will an H bar exhaust fit or is an X bar system the only option for my truck?



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 Posted: Mon Nov 20th, 2017 09:36 am
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I can answer part of this, headers and dual exhaust will certainly pass emissions as long as you have the catalytic converters on and there is no other underlying motor problems.

The stock tune will handle it. Tuning is so cool though LOL.

As far as the H or X bar no idea. I have read articles where it does nothing and articles that makes either sound like a must have.



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 Posted: Tue Nov 21st, 2017 02:58 am
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Eddie Money
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Excellent!! Thank you. My truck is primo!! I'm laying the foundation for the moddboxx supercharger. So a tuner will come later.

If anyone knows if an H bar crossover fits on a ranger please respond

My next questions. Is the stock sport model sohc 4.0L v6 built for low, mid or high range torque and horsepower. I have 3:73 gears but im planing on going to 4:10 gears and bigger tires. I also have a lead foot. Im trying to figure which band to tune the exhaust.

I know I want stainless pipes but I need more info on headers. Is there a preferred brand? Long or short style? I also want to keep the heat in the headers and out of the engine compartment. Is there a wrap or coating to assist with that?

I'm in no rush to make these upgrades. If they are pricey I'll save up but I want the best. But i don't mean titanium. Lol. I'd prefer to spend more for good equipment than to buy a pair of headers that rust out or leak and have to replace them over and over. Im building for reliability and longevity.

Last edited on Tue Nov 21st, 2017 03:56 am by Eddie Money



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 Posted: Tue Nov 21st, 2017 05:35 am
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Eddie Money wrote: Excellent!! Thank you. My truck is primo!! I'm laying the foundation for the moddboxx supercharger. So a tuner will come later.

If anyone knows if an H bar crossover fits on a ranger please respond

My next questions. Is the stock sport model sohc 4.0L v6 built for low, mid or high range torque and horsepower. I have 3:73 gears but im planing on going to 4:10 gears and bigger tires. I also have a lead foot. Im trying to figure which band to tune the exhaust.

I know I want stainless pipes but I need more info on headers. Is there a preferred brand? Long or short style? I also want to keep the heat in the headers and out of the engine compartment. Is there a wrap or coating to assist with that?

I'm in no rush to make these upgrades. If they are pricey I'll save up but I want the best. But i don't mean titanium. Lol. I'd prefer to spend more for good equipment than to buy a pair of headers that rust out or leak and have to replace them over and over. Im building for reliability and longevity.


Careful with S/C and exhaust size.. Dont work same as a turbo. S/C requires a whole other world of exhaust scavenging. Seen many S/C cars try to add Intake kits and or exhaust systems only to find out that it killed power.

May want to wait until after you successfully get the Moddboxx done if you can before throwing much wanted/needed funds at something that just may not work as you want..

As far as keeping the heat into the headers ceramic coating is what you want, if you live in a area of inclimate weather changes you really dont want to wrap an entire header, often the manufactures will deny any warranty due to that because it traps moisture. If anything, you may want to wrap a portion of the exhaust that goes around , near, or under the oil pan or trans pan to keep heat away from the fluids.

Check out HOT SHOT PERFORMANCE COATINGS Used them exclusively back in the day for a lot of track car customers.. which reminds me..

I'm not too sure of the exact specs on the SOHC but the OHV is meant for lower Tq and Mid power. Its great as a Street truck and freeway speeds and a tinge more but after 90'ish or so MPH you really start running out of legs.. Maybe with the introduction of a S?C that might move the power band a whole other level but my 93' OHV has 225 ft lbs of tq at 2200 RPMs at 160 hp [@ Flywheel].. Same 3.73 gearing.

your SOHV has I believe 207 Hp and I think you gained 12-14 ft lbs of Tq. (?)

BTW # titanium ftw ;)


Last edited on Tue Nov 21st, 2017 05:42 am by Undrstm8ed



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 Posted: Tue Nov 21st, 2017 06:22 am
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Eddie Money
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Ill check with moddbox on s/c and exhaust combo. Thank you for the heads.  up. Ugh doing it all at once will require a good chunk of change. Lol. Ill definatly notice the changes though!!

You are correct my sohc is 207hp according to factory specs.

The hot shot ceramic coating you refered to, is that something I can apply at home or do I need to Send my headers to them?

This was the info I was looking for. Thank you.

Last edited on Tue Nov 21st, 2017 06:22 am by Eddie Money



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 Posted: Tue Nov 21st, 2017 06:52 am
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Eddie Money wrote: Ill check with moddbox on s/c and exhaust combo. Thank you for the heads.  up. Ugh doing it all at once will require a good chunk of change. Lol. Ill definatly notice the changes though!!

You are correct my sohc is 207hp according to factory specs.

The hot shot ceramic coating you refered to, is that something I can apply at home or do I need to Send my headers to them?

This was the info I was looking for. Thank you.


Yea we ran several dyno runs on a few cars that were even factory S/C and spent an irritating time with swapping out intake kits and even 2 exhaust systems before we found a working combo on a good friend of mines vehicles. It would pain me to see others do the same.

Checking with Moddboxx they may be able to make some recommendations and assist your research into shorter time frames.

As far as the coating, that's a process done in their facility which if I recall is in Florida, A distant contact of mine on a business SM site is a custom fabricator down there too and uses them for all of his work too. I wish I could name drop someone for you there at Hot Shots but its been a decade since I was in contact with that person, sorry not much help there.





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"Be never first, never last and never noticed." - Unknown

"The slave is held most securely when he is held by the chains of his own will and of his own fears, and when he is locked down by his own slavish desires for a comfortable life." - Michael Bunker

"Mundus vult decipi, ergo decipiatur. Mundus vult decipi, ergo decipiatur" - ~ attributed to Petronius (Gaius Petronius Arbiter (ca. 27–66 AD))
Roman courtier during the reign of Nero.

"Those who expect to reap the blessings of freedom, must, like men, undergo the fatigue of supporting it." - Thomas Paine


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