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Old 12-22-2014, 07:29 PM   #1
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Chevy 3.6 heads

I recently traded in my wifes flex for a Buick Lacrosse. The car felt pretty strong in sport mode so I pop the hood to compare notes to my 3.7 the exhaust manifolds are this square flange with a converter connected to it. After doing some reading Chevy went to this in 2012 and now the 3.6 has 323 hp. Anyone else notice or read up on this. Headers are only available for the 2010-2011 camaro. Could this be the final info that long tubes arent benefical or is this more of an emission thing.
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Old 12-22-2014, 10:37 PM   #2
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Try this ... Exhaust Header - Explained: http://youtu.be/zi2BexMQlZY - I can see that being a cheaper more efficient way for a Auto maker to get the gasses out of the engine. Im sure with everything it can also be manipulated to produce a different result.

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Old 12-23-2014, 04:46 AM   #3
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One of the reasons they got the 323 HP was the fact the 3.6 is Direct Injection, it is good for a couple of more ponies but probably pretty close to be maxed out and able to meet EPA Standards.
As for the Shorties VS Long Tubes, I chose the legal for use on the public roads path with the Shorties, but there are a few of the Fastest 3.7's that switched to shorties from Long Tubes if that means anything.
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Old 12-23-2014, 08:30 AM   #4
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I'd be willing to bet those are just so they can use the same cylinder heads between that and the TT ATS-v, which likely just has a turbo arm Ecoboost style coming off the head.
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Old 12-23-2014, 09:23 AM   #5
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I remember reading an article about these when they first came out. I don't remember the specifics but that exhaust manifold is good enough to not be a restriction up to something like 600 - 700 hp. It does extremely well at exhaust scavenging and outperformed the best headers by a sizable margin. It also has the added benefits of saving weight, cutting costs, future proofing the engine (turbos) and also cuts down on emissions as the catalytic converter is usually right there.

This isn't new technology either. Honda and I think VW have been doing this for years. Also, Chrysler's Pentastar V6 has the integrated manifold.
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Old 12-24-2014, 12:38 AM   #6
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Quote:
Originally Posted by Ish416 View Post
I remember reading an article about these when they first came out. I don't remember the specifics but that exhaust manifold is good enough to not be a restriction up to something like 600 - 700 hp. It does extremely well at exhaust scavenging and outperformed the best headers by a sizable margin. It also has the added benefits of saving weight, cutting costs, future proofing the engine (turbos) and also cuts down on emissions as the catalytic converter is usually right there.

This isn't new technology either. Honda and I think VW have been doing this for years. Also, Chrysler's Pentastar V6 has the integrated manifold.
I figured you would chim in on this one. Yea my wifes lacrosse is far from restricted it runs good for a four door car and has good fuel economy.
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