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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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#1 |
SAAB Road Master
Join Date: Sep 2007
Posts: 305
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stock SE muffler vs. Flowmaster ?
Does anyone know if there is actually a performance gain by replacing the rear muffler alone or is it only sound and looks? I have a 2002 9-3se NORDIC stage 3+ with all the exhaust hardware to match. 3" downpipe and race cat. I am coming up on TUV or inspection for Germany and Flowmaster muffler's are forbidden here. I have to put the stock muffler on for inspection. Would I loose HP by just leaving the stock muffler on after inspection is over?
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#2 |
Avid TSL User
Join Date: Nov 2007
Posts: 112
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if you have replaced the d/p and centre section then fit a standard silencer to the rear you will create a restriction. how ever if you still have the standard saab centre section you wont notice any differance.
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#3 |
SAAB Road Master
Join Date: Sep 2007
Posts: 305
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If the middle section is only a striaght through pipe with resignators as sides, how is it restrictive? The stock muffler( while larger) is also a straight through pipe with baffles on the sides of the pipe. I am trying to understand how it is restrictive. I can put a flex pipe in one side and it slides effortlessly through and out the other side. and the middle section just looks like a gutted cat. School me
Last edited by 93nut; 05-10-2008 at 12:36 PM. |
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#4 |
Elder
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So your system looks like this?
turbo---3" DP--(race cat)-----(no resonator)-----flowmaster----tip. I think you WOULD lose a little top end. Stock is very restricitive compared to an aftermarket flowmaster. Can you post up a vid of what your flowmaster sounds like? I've never heard any muffler thats not straight-thru. is your flowmaster design straight thru or baffled like >>> |
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#5 |
Elder
Join Date: Sep 2005
Location: Land of 10,000 L-holes
Posts: 13,686
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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.
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always a SAAB guy at heart |
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#6 |
Elder
Join Date: Oct 2006
Location: Boulder Colorado
Posts: 3,153
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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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b234r ng900, E-85 Holset Super [email protected] mph a mile high 645whp/650wtrq Sae Denver To view links or images in signatures your post count must be 10 or greater. You currently have 0 posts. |
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#7 |
Elder
Join Date: Sep 2005
Location: Land of 10,000 L-holes
Posts: 13,686
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Bla bla bla. What is the back pressure on a new/good OEM vs Flowmaster or magaflow?
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always a SAAB guy at heart |
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#8 | |
SAAB Road Master
Join Date: Sep 2007
Posts: 305
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Quote:
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#9 |
SAAB Road Master
Join Date: Sep 2007
Posts: 305
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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.
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#10 | |
Elder
Join Date: Oct 2006
Location: Boulder Colorado
Posts: 3,153
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Quote:
![]() 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
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b234r ng900, E-85 Holset Super [email protected] mph a mile high 645whp/650wtrq Sae Denver To view links or images in signatures your post count must be 10 or greater. You currently have 0 posts. |
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#11 | |
Elder
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Quote:
![]() 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.
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Vitamin SAAB Last edited by liketheword; 05-10-2008 at 04:03 PM. |
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#12 | |
SAAB Road Master
Join Date: Sep 2007
Posts: 305
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Quote:
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#13 |
SAAB Road Master
Join Date: Sep 2007
Posts: 305
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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
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#14 |
Flirting With TSL Addiction
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i ran a viggen muffler with my stage 4 setup, and loved it
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#15 |
Elder
Join Date: Mar 2007
Location: Boston, MA
Posts: 7,349
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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.
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Yeah, T5.2 its -.3 better then the rest. 1989 900 SPG: Trionic 5(stg1), Aero seats, TD04-15G, 3" Turboback. SOLD 1993 9000 Aero: 3"Turboback, T5Suite Stg.3 |
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#16 |
Avid TSL User
Join Date: Jan 2008
Location: Ottawa, Ontario,Canada
Posts: 165
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Why is the flomaster illegal in Germany ?
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#17 |
Flirting With TSL Addiction
Join Date: May 2006
Posts: 675
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#18 |
SAAB Road Master
Join Date: Sep 2007
Posts: 305
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It's not TUV approved and their is no DB rating for a specific auto make. It's only rated at LOUD. LOL
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#19 |
Flirting With TSL Addiction
Join Date: Sep 2006
Posts: 896
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how does the saab sport muffler compare to the others, mayb you could use that?
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#20 |
Elder
Join Date: Oct 2006
Location: Boulder Colorado
Posts: 3,153
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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
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b234r ng900, E-85 Holset Super [email protected] mph a mile high 645whp/650wtrq Sae Denver To view links or images in signatures your post count must be 10 or greater. You currently have 0 posts. |
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