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  #1  
Old 15th August 2011
StraightAero StraightAero is offline
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Default "rams horn" exhaust manifold

Has anyone come across a tubular mandrel bent exhaust manifold? Im interested in finding a replacement for the stock cast one. I have a source to have one made BUT the cost will be something like my left arm and my right leg plus interest.
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  #2  
Old 15th August 2011
fox24racing fox24racing is offline
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+1 As the stock one looks to be very inefficient.
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Old 15th August 2011
StraightAero StraightAero is offline
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http://www.maptun.com/shopProduct.ph...&cg=757&car=95 found one but wow price is insane
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Old 15th August 2011
MI-Roger MI-Roger is offline
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Default Try GenuineSaab

GS listed one on their web site a few years back. Even if it is no longer one of their "on the shelf" performance parts they may have the prints/jigs to fab one for you.

Jak Stoll used to offer these too, but I don't know where he is working, if he still has the equipment to fab a tubular header, or if he still responds to e-mails sent to his old Jak Stoll Performance website.

IIRC Jak's price was the lowest, followed by GS, with Maptun and others significantly higher.

Hey! It looks like Jak has relocated to Portland Oregon and his web site is still active. Price listed at $800 or $1,150 each, depending on grade of stainless steel requested.

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  #5  
Old 15th August 2011
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WhiteT5 WhiteT5 is offline
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I wouldn't even think about messing with the exhaust manifold until you are pushing 400 hp. The stock unit is of the log-type, which isn't as efficient as tubular, but there are certainly worse designs out there. Go look at the manifold on a stock Volvo whiteblock, for example. Its downright awful.

Tubular manifolds are a giant hassle. You will have to relocate coolant and oil lines at the very least. There are probably several other modifications required as well.
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Old 15th August 2011
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Quote:
Originally Posted by WhiteT5 View Post
I wouldn't even think about messing with the exhaust manifold until you are pushing 400 hp.
Agreed, so many other things to spend money on before even having to think about worrying that the exhaust manifold isn't efficient. There are literally maybe a dozen, maybe 20 9-5's in the world that are making enough power that the factory exhaust manifold is a bottleneck/power limiter.
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Old 16th August 2011
Jssaab Jssaab is offline
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Quote:
Originally Posted by WhiteT5 View Post
I wouldn't even think about messing with the exhaust manifold until you are pushing 400 hp. The stock unit is of the log-type, which isn't as efficient as tubular, but there are certainly worse designs out there. Go look at the manifold on a stock Volvo whiteblock, for example. Its downright awful.

Tubular manifolds are a giant hassle. You will have to relocate coolant and oil lines at the very least. There are probably several other modifications required as well.
Quote:
Originally Posted by Cark View Post
Agreed, so many other things to spend money on before even having to think about worrying that the exhaust manifold isn't efficient. There are literally maybe a dozen, maybe 20 9-5's in the world that are making enough power that the factory exhaust manifold is a bottleneck/power limiter.
Actually you need a manifold to reloacte the turbo to install andythin glarger thatn a T25 TD04, or the intake pipe hits the AC bracket molded inot the block, not really for performance.. Tey alos don' thelp on tubo cars all that much
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