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Performance Modifications for the NG900 / Old 9-3 This forum contains PERFORMANCE related Q&A's for the NG900 and 9-3. This may also include suspension.

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Old 02-22-2008, 02:04 PM   #1
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Heat shield?

So i went driving with my friends the other night and we stopped and i popped the hood. I noticed my exhaust headers were glowing a light orange along with the exhaust housing of the turbo. This car is kinda stock when i comes to the engine (CAI, 3in cat back, mp fmic...)

Do you think a heat shield would be worth it? I know that wrapping is better, but in the end it can crack and mess up the headers (probably has yet to happen, but i dont want to be a first. A heat shield seems like a good compromise)

And secondly, do your opinions change if were talking about a stage 4 car?

aaaannnndd discuss!
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Old 02-22-2008, 02:11 PM   #2
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Your car comes with a heat shield stock for the manifold but I don't think its really needed. I ditched mine.

Also your headers are always going to glow a light orange/dark red right after boosting. Thats normal.



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Old 02-22-2008, 02:40 PM   #3
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Your car comes with a heat shield stock for the manifold but I don't think its really needed. I ditched mine.
I don't believe NG's came with the heat sheild over the exhaust manifold.


Just drive faster. More air will cool it down.
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Old 02-22-2008, 02:40 PM   #4
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Old 02-22-2008, 03:23 PM   #5
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og9-3 came with a heat sheild over the turbo.

I may ditch it, I do like that it hides how tiny that turbo is.
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Old 02-22-2008, 10:26 PM   #6
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The NG900 never had one, but you buy the one for the 9-3 pretty cheaply at the dealer. It is a nice dress-up piece, of nothing else. The only problem is that it's supposed to bolt to the manifold on one end, but the NG900's manifold isn't tapped for it. I left mine unbolted for a couple of years before I finally drilled and tapped the protrusion on the exhaust manifold and put a stud in there. It took me all of 5 minutes.
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Old 02-23-2008, 02:01 AM   #7
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I was thinking that this could be a bit of a performance thing though? Holding the heat in... I think i might grab one because i dont like that loose heat in the engine bay. Who has one laying around?

I heat wrapped my c900 and didnt realize there was a tiny gap left until i saw the thing glowing well orange.

And at the moment, im stock past a boost controller, but i am preparing for stage 4.
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Old 02-23-2008, 05:08 AM   #8
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I don't think the stock heat shield really offers that much heat protection. It is pretty tiny and thin (flimsy too). I really don't like mine because of how it really gets in the way of checking and making adjustments around the turbo.
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Old 02-23-2008, 11:01 AM   #9
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I really don't like mine because of how it really gets in the way of checking and making adjustments around the turbo.
it takes 3 minutes to take it off

they must have added them to 9-3 for a reason though. as small a difference as it might make, why add parts (and add cost) to a car if it's not needed, and have it cut into your profits?
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Old 02-23-2008, 11:57 AM   #10
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On my 2002 if the shield is taken off, the pipe that goes from the diverter valve to the cobra gets extremely hot. When on, then not hot at all. So it's doing some sort of shielding.
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Old 02-23-2008, 02:27 PM   #11
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they must have added them to 9-3 for a reason though. as small a difference as it might make, why add parts (and add cost) to a car if it's not needed, and have it cut into your profits?
They also put the intake resonator (AKA, WHOOSH-killer) on there for a reason, I imagine.

Meh, I pulled mine off a while ago. I think.
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Old 02-23-2008, 07:10 PM   #12
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it takes 3 minutes to take it off

they must have added them to 9-3 for a reason though. as small a difference as it might make, why add parts (and add cost) to a car if it's not needed, and have it cut into your profits?
Yeah but that bolt gets stuck sometimes, and now mine is stripped. Impossible to get off now. I think I'm just going to remove the whole thing and get rid of the hassle.


A real benefit would be ceramic coating the headers and turbo...... now THAT would help spool, lower underhood temps, look nicer......but cost $$$.
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Old 02-23-2008, 08:43 PM   #13
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i left mine on cause i like the idea it deflects the heat downward out the bottom of the car a little. probably not really noticable and it may only help very slightly but oh well. so i did some painting on mine to make it look a little nicer.

before-


after-
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Old 02-23-2008, 10:47 PM   #14
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after-
That looks great!

I should call up an exhaust shop to see how much ceramic coating would be. Anyone know already???
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Old 02-24-2008, 10:24 AM   #15
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is that bov any loud?
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Old 02-24-2008, 10:50 AM   #16
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That looks great!

I should call up an exhaust shop to see how much ceramic coating would be. Anyone know already???
A ceramic coating shop would do it, exhaust shops don't usually dabble in that stuff. The local place here in town will coat headers for about $125, coat turbos for about $250, and downpipes for $20 a foot (of length). That should give you an idea of the cost. They also say that they have seen improvements in not only performance but also fuel mileage after their coatings (tests were on a turbocharged diesel truck though).
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Old 02-24-2008, 08:40 PM   #17
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is that bov any loud?
yeah it is. i like how diverters sound when vented to atmo so i chose that over the forge bov. it just seemed more compatable and versatile yet still sounds great so i went with it
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