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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 09-19-2007, 08:08 PM   #1
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Exhaust, Sr20 style

Well most my buddies with 240s have an exhaust system that goes straight back from the downpipe then curves up to the muffler. I want to do the same thing with my saab and will probably get it done this week. My reasoning is it will flow alot better then the gobs of bends it needs to go the stock route, and it would also make it possible to do a 3 inch instead of 2.5.

Basically after the flex pipe, its going to be 2.5 or 3 inch (have not decided yet) straight back down the center line of the car. It will go right under the gas tank (I am making a heat shield out of sheet metal, and wrapping that portion with Exhaust wrap) and then right after the rear axle it is going to cut gradually up to the driver side and curve back to straighten it out into the muffler/tip. Anyone try this or see any problems with this? Will like input before I go lay down some moneys.
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Old 09-19-2007, 08:13 PM   #2
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I am thinking hot exhaust+gas tank= no good. Neat idea though. Just wouldn't do it on on a car I cared about..
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Old 09-19-2007, 08:17 PM   #3
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I am thinking hot exhaust+gas tank= no good. Neat idea though. Just wouldn't do it on on a car I cared about..

That seems to be a concern of alot of people. I really think with a heat shield and wrapping that 2 foot section that it would not be very hot, not to mention it is toward the rear of the car where the exhaust is dramatically cooling down. Or so I hope, I do not want to find out the hard way
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Old 09-19-2007, 09:33 PM   #4
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well if you ignite we'll all know its a bad idea. go forth and test it for us!
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Old 09-19-2007, 09:36 PM   #5
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Wrap that shit, dog.


Good luck, and take pictures!


I would also like to point out that the 9-3 (along with most new cars) has a plastic gas tank.


Be safe.
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Old 09-19-2007, 09:56 PM   #6
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That will hang down even lower off the bottom of the car, there is an indentation in the floor boards for your stock exhaust, and we all run 3" without a problem.
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Old 09-20-2007, 04:11 AM   #7
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Anyone try this or see any problems with this? Will like input before I go lay down some moneys.
I think your ground clearance will be 4 inches lower than the lowest spot on your gas tank if you do that. Take a tape measure and get under your car and look at what this means.

I would doubt the bends in the stock exhaust system pose any restriction whatsoever if you are using a 3" system.
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Old 09-20-2007, 04:17 AM   #8
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^^^

Yeah... unless you're gonna lift your car four inches before you do this (do it! hella rally stylez!), hanging a 3" pipe underneath the car will cause all sorts of clearance issues.
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Old 09-20-2007, 05:32 AM   #9
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The plastic gas tank is more likely to melt due to the heat. Plus the ground clearance would be a another big concern as mentioned.
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Old 09-20-2007, 07:43 AM   #10
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If you still have your plastic mid mount mud flaps - you allready know how much those rub Im sure. A full 3" exhaust outside of the channel will sit as low if not lower than those do.

I doubt however that the tank would melt from the exhaust heat - Im sure it has quite a high melt/flash point being a gas tank and exhaust temps that far back are pretty low.
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Old 09-20-2007, 07:46 AM   #11
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I doubt the gas tank would be an issue, the exhaust already runs very close to it, and the OEM heat shield makes things fine.

But as others suggested, this is not going to work well any time you are on a road that is not flat. Any time you straddle any sort of hump you're going to get massive dragging problems, possibly crushing the exhaust INTO your tank

Also, keep in mind that there are 500+ hp ng900/9-3s running around with the exhaust running in the stock location. The gains probably don't outweight the bennefits.

Now, that said, go try it and report back!
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Old 09-20-2007, 07:51 AM   #12
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make the exhaust terminate on the side between the front and rear doors, sort of like cobras..
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Old 09-20-2007, 07:56 AM   #13
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make the exhaust terminate on the side between the front and rear doors, sort of like cobras..
Cool idea.... but you'd still have it hanging 4" below the rest of the car.
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Old 09-20-2007, 07:58 AM   #14
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make the exhaust terminate on the side between the front and rear doors, sort of like cobras..
That wont pass inspection in most states. It might even be federal that the exhaust has to dump past the rear most operable window.
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Old 09-20-2007, 08:02 AM   #15
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That wont pass inspection in most states. It might even be federal that the exhaust has to dump past the rear most operable window.
It'll fly in Alabama :lendostar:
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Old 09-20-2007, 10:13 AM   #16
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That wont pass inspection in most states. It might even be federal that the exhaust has to dump past the rear most operable window.
That isn't a concern for us here in KY.
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Old 09-20-2007, 10:14 AM   #17
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Side pipes!
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First T7 19T turbo setup. First T7 Deka 80lb. injector setup.
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Old 09-20-2007, 10:27 AM   #18
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screw side pipes. open headers.
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Old 09-20-2007, 10:53 AM   #19
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screw side pipes. open headers.
And then you spool the turbo with hopes and dreams?
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Old 09-20-2007, 10:58 AM   #20
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through the hood stacks...turbo spooled with hopes and dreams. 80 psi agressive tune!
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