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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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Thread: stock SE muffler vs. Flowmaster ? Reply to Thread
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Topic Review (Newest First)
05-20-2008 01:34 AM
93nut Inspection is every 2 years and yes I did just put the stock muffler on only for inspection. I had to buy a new OE muffler this year for inspection because my original was rusted out with holes. It's pretty easy to swap them, 2 bolts and three hangers. I have the Flowmaster muffler welded to a section that matches the pipe fittings so it bolts up just like the stock muffler. I live in a gated neighborhood and the Flowmaster was starting to get me dirty looks by the older people on my block. I think I own the oldest car in my neighborhood. . As for after market mufflers that are allowed for Saab here in Germany, Hirsch has the market cornered all by itself. Damn near 400 Euros just for thier muffler so I can have legal paper work is not worth it to me. I ran the Flowmaster all year anyway but if I wreck on the Autobahn and they do thier manditory inspection of my car, I will get [email protected]#*ed for every aftermarket piece of equiptment that I don't have GERMAN paperwork for. OUCH!
05-19-2008 09:27 PM
Palmer
Quote:
Originally Posted by Topher View Post
So easy! I have like three tech2's in my garage!

Same here.


I use one to prop the door open when I paint.
05-19-2008 09:22 PM
Topher
Quote:
Originally Posted by JZW View Post

Its an easy thing to test. Take a tech2...
So easy! I have like three tech2's in my garage!
05-19-2008 08:44 PM
JZW Yea, we live with what we can work with and I was not arguing with you, more the other people that were saying the stock muffler is just fine.

I thought the ferrita was ok since Maptun sells them, what about borela?

Is it just for inspection? Can you run stock for inspection, then bolt up a ferrita or something for the rest of the year or two?

I have to put my stock ecu, full cat dp in and stock fuel injectors to pass emmisions here in my state, Colorado USA. Then after I pass I have two years before it has to be tested again. I then put the big fuel injectors back in the car, the free flow dp and tuned ecu with lots of timing and fuel...

Good luck,

John
05-19-2008 01:08 PM
93nut I guess the only problem that might be effecting performance would be the bottle neck effect at the stock muffler because everything else is 3" pipes. Once again, AFAIK, only stock, OE mufflers are alowed for saabs here in Germany. Thats why I have to have the original muffler on the car. Not my choice, just the LAW!
05-19-2008 08:11 AM
JZW We tested the saab sport 2.5" against and full 3" with magnaflow and got similar results, less knock on the full 3" system.

That is the bottom line, less knock levels read is always good

What that would mean for t7 is that it would have to work less hard to make mass air requirement. Its still a good thing to have for performance in my opinion.

I am sure you can get away with a stock muffler and good dp, but why not go the extra step and not just "get away" with something and have a full 3" with a good flowing cat and a good muffler?

If there were no benifits, race cars would have full cats and mufflers and those turn out cat and muffler by-pass valves would not exist.

Check out Nicks test, open dp and full system.
http://genuinesaab.com/gallery/Gt307.../compareopendp


John
05-19-2008 06:47 AM
jonny72888 how does the saab sport muffler compare to the others, mayb you could use that?
05-19-2008 01:09 AM
93nut It's not TUV approved and their is no DB rating for a specific auto make. It's only rated at LOUD. LOL
05-18-2008 07:58 PM
DViggen Sound restrictions probably. I also don't think they have undergone the TUV testing.....

I know that with my Jetta, I was able to get away with a Borla muffler for TUV.....I failed with a Magnaflow muffler.

Quote:
Originally Posted by Saab9-3se View Post
Why is the flomaster illegal in Germany ?
05-18-2008 07:07 PM
Saab9-3se Why is the flomaster illegal in Germany ?
05-18-2008 05:10 PM
dan-the-kid I got a 3" waiting to be put on....

JP DP, Magnaflow cat, straight though, to a magnaflow muffler. My guess is that its gonna sound sick.
05-18-2008 01:55 PM
aero93 i ran a viggen muffler with my stage 4 setup, and loved it
05-18-2008 11:35 AM
93nut The difference in performance was only different until the ECU re-adapted to the new muffler. After a couple of good WOT autobahn runs, the factory muffler was stinking like burnt metal and the car is now boosting the same as before, just quieter. LOL
05-11-2008 12:24 AM
93nut
Quote:
Originally Posted by JZW View Post
More

Its an easy thing to test. Take a tech2 from a shop and test the knock level with stock muffler or mufflers and then put a magnaflow on there and see what the knock level is after the swap.

Same with the back-pressure. See what you're boost is with the stock muffler and then put a good magnaflow on there and see what it is then. We saw a 2-3psi increase in boost from swapping the muffler only...

John
I thought a T7 ecu would lower boost to provide the same amount of power if the back pressure was lowered. I would think that such a smart ecu would raise boost to compinsate for the power LOSS. Thats the way I see it. Maybe I'm wrong. IDK. German Saab stealerships will not let me play or handle the tech2 for muffler testing. The stealership always wants my car to go under the knife to figure out what all has been done. Nordic tuning boggles thier minds. LOL
05-10-2008 04:00 PM
liketheword
Quote:
Originally Posted by JZW View Post
More

Its an easy thing to test. Take a tech2 from a shop and test the knock level with stock muffler or mufflers and then put a magnaflow on there and see what the knock level is after the swap.

Same with the back-pressure. See what you're boost is with the stock muffler and then put a good magnaflow on there and see what it is then. We saw a 2-3psi increase in boost from swapping the muffler only...

John
This is why only a straight pipe should be considered for the whole exhaust system.



The stock exhaust does quite well for performance as long as you have the dp setup already. If you have concerns about back pressure remove one of the 2 mufflers and call it a day before you spend your time and money for next to no gain.
05-10-2008 02:25 PM
JZW
Quote:
Originally Posted by JK View Post
Bla bla bla. What is the back pressure on a new/good OEM vs Flowmaster or magaflow?
More

Its an easy thing to test. Take a tech2 from a shop and test the knock level with stock muffler or mufflers and then put a magnaflow on there and see what the knock level is after the swap.

Same with the back-pressure. See what you're boost is with the stock muffler and then put a good magnaflow on there and see what it is then. We saw a 2-3psi increase in boost from swapping the muffler only...

John
05-10-2008 01:41 PM
93nut I was looking for a dyno or flow chart but haven't found one. My but dyno says the stock muffler gives me more torque. Well, thanks for all the replies.
05-10-2008 01:38 PM
93nut
Quote:
Originally Posted by JK View Post
Why do people always say that the stock stuff is restrictive?!?

Has anyone ever cut one apart? There is just a perforated tube going STRAIGHT THROUGH, there are no baffles, no chambers. Its small-ish, like 2 3/8" but I hardly think its restrictive other than maybe if its old, rusted out and collapsed.

As far as flowmasters, most, if not all of them are baffled/chambered in design.
The muffler is brand new. Made by Walker and I had suspisions that other than looks and sound, that the Flowmaster is more restrictive because it is not a straight through muffler like the stock muffler is. The flowmaster is just smaller and louder.
05-10-2008 01:30 PM
JK Bla bla bla. What is the back pressure on a new/good OEM vs Flowmaster or magaflow?
05-10-2008 01:17 PM
JZW Cut apart? We have measured back pressure and knock on them

We also found the flowmaster to be more restrictive than the magnaflow! Gained 2-3psi on same sw with that change only and the knock levels were lower too!

Many people and companies have tested the back pressure and flow of these mufflers and when you put a magnaflow on the car and pick up psi and spool, well its a no brainer...

John
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