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Old 03-01-2008, 11:13 PM   #1
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Default Anyone using Grand Prix PEMS?

Got a guy locally who is doing nice work porting the Gran Prix exhaust manifolds. We eyeballed the GP manifold vs mine, and they looked the same, but being on the car made the comparison something less than exact. Used the search engine, but didn't find anything concrete.
Anyone using GP PEMS? Does anyone know any years/apss that would fit my 95 L36?
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Old 03-01-2008, 11:15 PM   #2
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The are offset a bit different.

http://www.bonnevilleclub.com/forum/...light=manifold

I know jshelton once ran GP manifolds on his Bonnie, but that was 00+

If you are OK with your entire exhaust system being a tad crooked, it might work.
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Old 03-01-2008, 11:37 PM   #3
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Well, damn, why did I not find it when I searched.
Thanks! Will have a read.
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Old 03-03-2008, 01:18 AM   #4
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the front and xover are the same. The rear mani comes out about 1-2inch offset from a GP.

You really don't need a ported rear...normally. the rear flows quite well for a stock manifold.
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Old 03-03-2008, 02:07 PM   #5
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Quote:
Originally Posted by 13secGTP
the front and xover are the same. The rear mani comes out about 1-2inch offset from a GP.

You really don't need a ported rear...normally. the rear flows quite well for a stock manifold.
The front was the big concern for me.
If the fronts are the same, I am in like Flynn.
Thanks!
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Old 03-03-2008, 02:12 PM   #6
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Keep in mind you may need to get a skewed set of injectors to make full use out of that new front mani,
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Old 03-03-2008, 05:42 PM   #7
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Care to expound on that Sandrock?
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Old 03-03-2008, 06:26 PM   #8
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Dons the person that is better suited to answer that one...if he sees this post
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Old 03-03-2008, 07:04 PM   #9
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If airflow is uneven between the front and rear, to gain the most of the mod, a tuner can be used to skew the higher flowing 3 slightly richer. This is common with the powerlog.

If a tuner isn't available, you can skew your injectors through FIE to be 2% or so richer on the front (or whichever side flows better).

The Plog outflows a good PEM with built up necks. Almost too much flow. To get the most of it, a skew is necessary.
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