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Old 11-15-2014, 11:21 PM   #1
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Intake manifold replacement

I have a 99 mustang gt, which I am currently putting a 96 4.6 motor into. While I was swapping the intake manifold from the old motor I noticed the plastic was starting to disentegrate around the back edges. I'm 100% sure I need to replace it. I have stock heads and I was wondering if I should just buy another oem plastic intake or maybe upgrade to aluminum or something else. Any suggestions?
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Old 11-16-2014, 12:05 AM   #2
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You do know that these intakes are different right? Pi vs npi?

I've seen the intakes do this. Relace it.
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Old 11-16-2014, 12:20 AM   #3
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Get a Ford racing PI intake for it. Their about 235 bucks or so from AM and I think rockauto has them Also. This will give you piece of mind. Also are using the heads off of the 99? Just asking since their PI heads verse the NPI heads on the 96 motor. You will Also get a Nice little bump in compression with the PI heads on the NPI motor.

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Old 11-16-2014, 10:43 AM   #4
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verify that you have the PI heads, i forgot what year made the change. dont forget to find a reliable torque diagram for the bolts, you want to torque it down correctly for the correct year model. if you use the ford racing one, you will need gaskets for it. felpro makes a decent one at autoparts stores. do not waste your time with the dorman part. its pretty straightforward. remove coils, fuel rail, injectors, and other stuff in your way. clean up what you can in all the tight spots if you like a clean engine bay.
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Old 11-16-2014, 10:54 AM   #5
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99-04 gt had pi heads. 96-98 don't.

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Old 11-16-2014, 11:16 AM   #6
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Ok. Like i said, make sure you get the torque pattern for the 99. And a torque wrench of course. After all.this work, last thing you want is a vacuum leak.

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Old 11-16-2014, 01:24 PM   #7
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And don't get dorman intake. My gt feels so much slower compare to my old one and my gf's gt.

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Old 11-16-2014, 01:38 PM   #8
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Quote:
Originally Posted by XSlashDashX View Post
And don't get dorman intake. My gt feels so much slower compare to my old one and my gf's gt.

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Probably a bit noisier too?

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