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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 07-21-2005, 07:16 AM   #1
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Straight pipe installation in place of cat...

Just wondering, would my figures increase any? I know they'd be slight, but I've read you can get some better fuel economy and performance from straight piping the part of the exhaust that includes the catalytic converter... could this fuck with my emissions though? I know I got rid of the cat on my old Mazda 626 (87... first car) and on the highway I did like 40 mpg. I just wanted some opinions here. I think I might just do it and see what happens. I guess I could always just plug it back in if I didn't like it... we don't have inspections in MI...
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Old 07-21-2005, 07:18 AM   #2
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my first car was 89 626, i beat the hell out of that car. I ran it with out a car, only because the exhaust rusted off right there. It was like driving a monster truck
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Old 07-21-2005, 07:31 AM   #3
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Was such a cool car... I really regret getting rid of it... I wish I still had it to drive in the winter :(
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Old 07-21-2005, 07:36 AM   #4
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whats up Kept,

Im getting a custom 3" Straight pipe set up from the 3" MP DP+CAT back today acutally haha, lol i'll let u know how it goes/sounds. ..ive heard real positive stuff regarding straight pipes. ..
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Old 07-21-2005, 07:44 AM   #5
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From what I've read, it's possible that I might be sacrificing some of my low end torque for incremental increases like 4-10 top end HP... I think i might try it just for shits and giggles and if I don't like it, just throw it back in...
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Old 07-21-2005, 07:49 AM   #6
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are you talking about throwin out your cat?? gotcha.
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Old 07-21-2005, 07:53 AM   #7
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I might pull it out just to see how it feels... drive it around a bit and then if I am not satisfied with the results (drop in fuel efficiency or low end torque, as mentioned) i'll pop it back in. We have a hydraulic lift at my house with a full shop, so this isn't anything hard to do.
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Old 07-21-2005, 08:03 AM   #8
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I've been thinking about doing a 2.5" straight cat-back exhaust at the end of August, and I've got some of the same questions as Unkept. With an automatic trans ng900 2.3 N/A, will I gain any hp, and if so will it be worth the cost? And will I lost some torque like some have said?
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Old 07-21-2005, 08:31 AM   #9
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Guys, you can't replace the cat with a straight pipe on an N/A. You will lose backpressure which will result in MINUS HP! Try a sport cat.

The max you should go for an exhaust is 2.5". Which is my plan for this summer with a custom exhaust manifold.
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Old 07-21-2005, 08:57 AM   #10
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2.5" exhaust is awfuly large for an NA 2.25" is good enough.. hell some turbo cars dont go bugger than 2.5" also a straight pipe on an NA will result in less power due to less bacfkpressure
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Old 07-21-2005, 09:22 AM   #11
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The backpressure will actually result in less torque, but more HP. I've also heard in the Jeep world, not sure if it applies in the SAAB world, too, that removing the cat can cause premature valve seat and valve seal wear. Like I said, it applies to Jeep 2.5 and 4.0L engines, but not sure about the SAAB 2.3L. I agree, just go with a highflow unit, if you really want to get more flow. If you were doing just 'cause its a cheap mod, don't bother.
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Old 07-21-2005, 11:29 AM   #12
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I'm not talking about removing my cat, I'm talking about running a 2.5" pipe from there to the muffler (I'd be getting a sport muffler too). There's a place near me that does a great job for pretty cheap, but all told it'll still be a little over $200. Is it worth the money? I'm in college, so 200 is a lot of money.
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Old 07-21-2005, 12:29 PM   #13
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ERP has done this

http://www.lehigh.edu/~cak7/Upgrades...atRemoval.html

i believe it'll increase top end power and get quicker spool and your car will definitely be louder w/o it
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Old 07-21-2005, 01:22 PM   #14
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He doesn't have a turbo!
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Old 07-22-2005, 05:21 AM   #15
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d'oh
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Old 07-22-2005, 07:34 AM   #16
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Hence the N/A Performance Mods section
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Old 07-22-2005, 11:23 AM   #17
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Quote:
Originally Posted by saabvos
d'oh
i saw the word performance and read the thread, should've read the WHOLE title
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