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N/A Performance Modifications for the NG900 / Old 9-3 This forum contains PERFORMANCE related Q&A's specific to NATURALLY ASPIRATED NG900 and old 9-3.

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Old 03-12-2005, 07:52 AM   #1
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Good Exhaust Size for an N/A

So the stock exhaust system I believe is 2.25" on an N/A car. I think I might take it to a local stainless steel exhaust place in town and replace most of the exhaust system, minus the cat of course, with bigger tubing. Two questions:

What size should I get, 2.5" or 3" exhaust?

Should I get the intermediate muffler thingy removed and just leave the cat on the system and the rear muffler? Or will this fail emissions?
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Old 03-12-2005, 08:04 AM   #2
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it should be fine with just one mufler. the saab sport exhaust, even the stock viggen exhaust has only one muffler. i believe 3" piping will hurt performance. its good for turbos but bad for us n/a motors.
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Old 03-12-2005, 08:10 AM   #3
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i would def go with 2.5 and a AERO-TURBINE for a muffler. 3" is going to be to much for you.
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Old 03-12-2005, 08:14 AM   #4
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Quote:
Originally Posted by snow4_1man
i would def go with 2.5 and a AERO-TURBINE for a muffler. 3" is going to be to much for you.
Sweet 2.5" it is, and I will get rid of those other mufflers/resonators. I'll call Monday and see how much it will be. How much do you guys think it will cost?

What's an AERO-TURBINE muffler?
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Old 03-12-2005, 09:48 AM   #5
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The aeroturbine is the one I'm running..

barely weighs 5 pounds compared the 30+ pound SAAB muffler... stainless, and pretty much straight thru.

I run sort of a hump back solution now.....to keep torque band low relative to a turbo'd car.

I think you'll be extremely impressed with their cost effective solution for performance...and a good sound. Blaque_Out can give you his impression of the sound. But to me...not ricey.., just a deep resonating but smooth sound as you need more throttle.

I took some pics here somewhere....here
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Old 03-12-2005, 10:45 AM   #6
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I already have a sweet aftermarket muffler on. It sounds amazing. But I want it louder, so I want to get a bigger exhaust to increase the overall flow...
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Old 03-12-2005, 12:27 PM   #7
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def. 2.5" b/c 3" is way too big for the N/A
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Old 03-12-2005, 12:28 PM   #8
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DC, i see nothing
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Old 03-12-2005, 01:16 PM   #9
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I feel that there is no such thing as too big... an 8.5 inch should suite your needs quite well while providing a sporty sound. LMFAO nah everyone seems about right... 2.5 or 2.25 should do it for an N/a saab... find your self a nice used viggen exhaust... cheap and great fix.
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Old 03-12-2005, 02:28 PM   #10
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yeah listen to boxerchip and get a used viggen exhaust, or you can just wait for results after i install mine, which he better be shipping on monday haha j/k, take your time shipping i wont be back home to install it until a few days before easter anyway
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Old 03-12-2005, 02:34 PM   #11
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Aren't you turbo now anyway citron? Or is that someone else who went from N/A to turbo because they couldn't handle all the crap
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Old 03-12-2005, 02:36 PM   #12
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nah, im still slow/ pathetic n/a. but at least it looks and sounds good
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Old 03-12-2005, 02:43 PM   #13
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well shit man... you want one of my turbos? ive got 2 now... so ya know i figure ill spread a little love around.
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Old 03-12-2005, 02:45 PM   #14
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haha, its not worth it. spend like 2 g's making it turbo, only for it to blow up in the next few weeks
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Old 03-12-2005, 03:07 PM   #15
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There is an N/A owner on here that did that. I can't remember his name...Just recently turned it into a turbo.
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Old 03-12-2005, 03:10 PM   #16
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try and find out so we can get some pics or something id realy like to see what it took. im pretty sure the motor could handle like 5 psi TOPS without damage, if its the n/a motor. i wonder how much money he spent
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Old 03-12-2005, 03:30 PM   #17
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2.25" would be large enough for around 230 hp. Just find someone with an old Viggen muffler section. Should bolt up, not be too loud, and flow well.

2.5-3.0 is overkill for a car that won't make more than 250 hp on pumpgas. Larger pipes also tend to be louder. But the choice is yours.

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Old 03-12-2005, 03:44 PM   #18
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Well I want louder, and I don't like stock
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Old 03-12-2005, 05:37 PM   #19
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Quote:
Originally Posted by rcmdesign
Well I want louder, and I don't like stock
Ok. Actually, I usually think the same way.
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Old 03-13-2005, 08:37 AM   #20
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Originally Posted by citronxbeige
DC, i see nothing
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