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Old 04-04-2012, 08:30 AM   #1
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pi swap

What exactly is the pi swap? And what kind of gains does it give you?
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Old 04-04-2012, 10:54 AM   #2
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I've been wondering about this myself so far what I've figured out that performance improvement is what pi stands for
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Old 04-04-2012, 11:04 AM   #3
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They are the heads off a 99-04 GT. They gain something like 40-60 HP if I remember correctly. They bump up compression from 9:1 on a NPI set up to like 9.5:1.
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Old 04-04-2012, 11:06 AM   #4
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I've heard that's its the 99 and up heads and intake, but if I was gonna go through that trouble id go for the dohc swap.

---------- Post added at 12:06 PM ---------- Previous post was at 12:05 PM ----------

Quote:
Originally Posted by JDF
They are the heads off a 99-04 GT. They gain something like 40-60 HP if I remember correctly. They bump up compression from 9:1 on a NPI set up to like 9.5:1.
Thanks, how much does that usually run? And do you just have to swap.the heads?
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Old 04-04-2012, 11:12 AM   #5
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Quote:
Originally Posted by taylor98gt
I've heard that's its the 99 and up heads and intake, but if I was gonna go through that trouble id go for the dohc swap.

---------- Post added at 12:06 PM ---------- Previous post was at 12:05 PM ----------



Thanks, how much does that usually run? And do you just have to swap.the heads?
A dohc swap is way more money and requires a lot more work. A pi swap is basically heads and intake manifold. Lots of guys take the opportunity to upgrade cams as well.
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Old 04-04-2012, 11:13 AM   #6
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Quote:
Originally Posted by taylor98gt
I've heard that's its the 99 and up heads and intake, but if I was gonna go through that trouble id go for the dohc swap.

---------- Post added at 12:06 PM ---------- Previous post was at 12:05 PM ----------



Thanks, how much does that usually run? And do you just have to swap.the heads?
A DOHC swap would be awesome.

And it just depends on who's selling them. I believe you do need the intake. I have a 2000 GT so I can't say from experience on anything really.
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Old 04-04-2012, 11:43 AM   #7
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Quote:
Originally Posted by JDF

A DOHC swap would be awesome.

And it just depends on who's selling them. I believe you do need the intake. I have a 2000 GT so I can't say from experience on anything really.
Thanks, I might try it in a few weeks and see how it works out
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Old 04-04-2012, 12:21 PM   #8
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Quote:
Originally Posted by taylor98gt

Thanks, I might try it in a few weeks and see how it works out
Good luck
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Old 04-04-2012, 08:36 PM   #9
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Re: pi swap

I can tell you from experience to research a little bit before you dive in. Right now my car is on hold because I didnt realize when you do the swap you need the heads, cams, intake(tapped for the second coolant sensor), and the heater pipe that runs under the intake for a 99-04. Trust me there isnt any way to make the old one work or use rubber hose. If there was I would be driving my car right now. Dont forget you will need all new head bolts also. All in all its not that bad of a job just make sure to gather everything first. Also I thought it bumped the compression up to 10.5 to 1, I could be wrong on that.
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Old 04-05-2012, 09:19 AM   #10
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Quote:
Originally Posted by clark98gt
I can tell you from experience to research a little bit before you dive in. Right now my car is on hold because I didnt realize when you do the swap you need the heads, cams, intake(tapped for the second coolant sensor), and the heater pipe that runs under the intake for a 99-04. Trust me there isnt any way to make the old one work or use rubber hose. If there was I would be driving my car right now. Dont forget you will need all new head bolts also. All in all its not that bad of a job just make sure to gather everything first. Also I thought it bumped the compression up to 10.5 to 1, I could be wrong on that.
Thanks, I'm glad you told me, sorry to hear about your car, hopefully you get it straightened out soon!
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