SaabCentral Forums banner

1 - 10 of 10 Posts

·
Registered
Joined
·
118 Posts
Discussion Starter #1
Hi guys,

I FINALLY laid my hands on a Hirsch Catback for my 2004 9-3SS now I'm sourcing for a 3" Downpipe.

Will someone tell me what will be the best fit? (BSR? Ferrita? or etc?)
I don't want to do anything to my precious Hirsch :cool: hence I need to plug and play my new downpipe

Thank you
 

·
Registered
Joined
·
2,450 Posts
I believe that Hirsch is a 2.5" system so you will have to do something regardless. You don't have to chop it into tiny pieces to get it to fit or anything. It's not like something bad is going to happen to your exhaust. It's underneath the car all day anyways so it's going to look like crap eventually. It wouldn't be much different even if you were to go 3" exhaust into the 3" downpipe. The only possible way to get around something like this is to buy a full 3" system from one of the tuners.
 

·
Registered
Joined
·
118 Posts
Discussion Starter #3
cjhutch said:
I believe that Hirsch is a 2.5" system so you will have to do something regardless. You don't have to chop it into tiny pieces to get it to fit or anything. It's not like something bad is going to happen to your exhaust. It's underneath the car all day anyways so it's going to look like crap eventually. It wouldn't be much different even if you were to go 3" exhaust into the 3" downpipe. The only possible way to get around something like this is to buy a full 3" system from one of the tuners.
Yes Hirsch is a 2.5" Not sure you had seen a Hirsch Exhaust it has an unqiue design in which from the centre box, there's a pipe up and a flange.

My worry is that is there any available downpipe that will fit to the flange w/o cutting the existing Hirsch.:roll: I'm not worry abt something bad happening to my Hirsch with another brand of Downpipe just worry in terms of fitting compatibility

Anyone with Hirsch Exhaust experience?
Thank you
 

·
Registered
Joined
·
2,450 Posts
I'm confused on what you are saying. I have not seen a Hirsch exhaust, but I'm pretty sure it looks similar to the stock exhaust with Hirsch being a factory tuner for Saab. I'm sure they wouldn't do anything like create some special flange for their exhaust when guys at dealerships will have to install the exhaust if a customer orders one. With them being a factory tuner more than likely they keep things easy for the dealerships.
 

·
Registered
Joined
·
118 Posts
Discussion Starter #5
cjhutch said:
I'm confused on what you are saying. I have not seen a Hirsch exhaust, but I'm pretty sure it looks similar to the stock exhaust with Hirsch being a factory tuner for Saab. I'm sure they wouldn't do anything like create some special flange for their exhaust when guys at dealerships will have to install the exhaust if a customer orders one. With them being a factory tuner more than likely they keep things easy for the dealerships.
Sorry for the confusion, Hirsch exhaust fit perfectly with the stock Downpipe that for sure as I had fitted it easily :) .

Look at the attached photo you will after the centre box there's a pipe with a flange up (top right of the pic)

I'm worried a aftermarket DP can fitted perfectly to the end of this w/o modifying the Hirsch exhaust.

Any comments? Thank you again
 

Attachments

·
Registered
Joined
·
2,450 Posts
That's just a mounting flange. The downpipe you get will have a flange of it's own that will mate up with that. You won't have any problems. I would strongly recommend a tune if you are going with an upgraded exhaust. It will really bring the car together and presto you are at Stage 3 tune and driving a completely different car.
 

·
Registered
Joined
·
118 Posts
Discussion Starter #7
cjhutch said:
That's just a mounting flange. The downpipe you get will have a flange of it's own that will mate up with that. You won't have any problems. I would strongly recommend a tune if you are going with an upgraded exhaust. It will really bring the car together and presto you are at Stage 3 tune and driving a completely different car.
Yes that's a mounting flange, my biggest worry is the aftermarket dp can fit into this as the length from the base of the car up to the mounting flange is quite a distance, to my limited knowledge I know the aftermarket DP will be long hence will these 2 overlap and causing a problem and resulting to a modification to the Hirsch Catback cut the pipe to shorten it?

Yes I agree with the upgrade DP I will need to re-opt the software and that's what I'm eyeing on :cool: BUT need to find my DP :cry: 1st

So does anyone has a BSR or Ferrita DP in which can fit into a Hirsch Cat Back? Thank you
 

·
Registered
Joined
·
943 Posts
Answer is, YES, ferrita has a stock replacement DP for 3". but its not the performance Cat that you see on the tuned catalog.

As for the other DPs, sorry, you'll have to cut the hirsch exhaust, which to me is a pain in the *** to do it to something you paid so much for.

the twin pipe Hirsch Exhuast is 3" though.

The limiting factor in the DP is not the DP circumference itself, but in the flow rate of the CAT. if you actually see the stock downpipe, its actually almost 4-5".

but the Downpipe thats designed for the tuners actually have 3" circumference all the way to the middle of the car, just before the mid-box. that helps to get heat away from the turbo fast. if yours is 2.5, the change in the dp isnt going to be of much help, cause the widest point is still till the start of the hirsch cat back, which is 2.5"

Try switching out the CAT on the current dp and maybe play with the O2 sensor.

I doubt you're from the states right?
 

·
Registered
Joined
·
118 Posts
Discussion Starter #9 (Edited)
Dach said:
Answer is, YES, ferrita has a stock replacement DP for 3". but its not the performance Cat that you see on the tuned catalog.
That's cool!! Any link for me?
Can I request Ferrita for a performance Cat

Dach said:
As for the other DPs, sorry, you'll have to cut the hirsch exhaust, which to me is a pain in the *** to do it to something you paid so much for.
Yes I found someone knowing what I'm talking abt :cool:
Yes I don't want to modified the Hirsch as it's 1 of the few nice exhausts that I had seen! Btw, mine is a used one :cheesy: hence not so expensive

Dach said:
The limiting factor in the DP is not the DP circumference itself, but in the flow rate of the CAT. if you actually see the stock downpipe, its actually almost 4-5".

but the Downpipe thats designed for the tuners actually have 3" circumference all the way to the middle of the car, just before the mid-box. that helps to get heat away from the turbo fast. if yours is 2.5, the change in the dp isnt going to be of much help, cause the widest point is still till the start of the hirsch cat back, which is 2.5"
Interesting point yet to take a closer look on the stock downpipe since changing the Hirsch exhaust doesn't need to remove the Downpipe, I'll make a point to look at the diameter.

So you are suggesting no point changing to a larger diameter downpipe with the Hirsch as Hirsch is 2.5"? But I found MapTun or Nordic also having 3" Downpipe with 2.5" Catback

Dach said:
Try switching out the CAT on the current dp and maybe play with the O2 sensor.
Why so? Suggestion? software tuning not required?

Dach said:
I doubt you're from the states right?
Yup Hirsch not available in the states
 

·
Registered
Joined
·
943 Posts
Ok, first things first, your stock cat is at least a 600 cell CAT. is your car tuned?
And where are you from, so I can have an idea what type of ECU you're running on.

For Non-US ECUs
If you're going to be on a stock program, changing out the CAT will not throw CELs (I think) as the tolerances are wider. If you're on a tuned software, its definitely going to throw CEL, but its not going to affect the performance (much) To go around that, you'll have to move the O2 sensor either forward to the front, unlikely, or backwards to the rear. (depending on what year your car is, if its 2003, its another PITA and I suggest not doing it cause I have no solution to that generation of cars yet). If its 2004-2005, then we have got hope.

You can try to use a 200 Cell performance CAT, I think there is some sort of rating/standard for it, but I can't remember off hand at the moment. I am on a 100 cell CAT. I have added a resistor to "fool" the O2 sensor regarding the amount of gasses going through. Even then, it is sensitive (which it should be) to the type of gasoline used. Premium only. What are the ambient temperatures of your location? if you're stuck in traffic and you keep gunning the engine, CEL will come on, after 2-3 re-starts of driving of at least 15 mins each time, the CEL will go away. Performance is not inhibited, no limp home mode.

Is this mod for everyone? no, especially not the US ECUs. is this for the freaky paranoid CEL watcher? no, cause in hot slow traffic conditions with ah heavy gunning right foot, it does come on.

Is this for the guy who has got some time, some patience on his clock to try it out and get a whoopass bang for the buck performance from 100kmh to infinity.... well HELL YEAH! ok .. got to calm down and get that camomile tea going.

My tip, before you play with the DP and the CAT, please install an exhaust temp gauge, a OIL temp gauge and while you're at it, a Boost meter. I'd suggest Defi Meters as they are one of the most accurate ones around.

You'll want to monitor the difference in the exhuast temp before and after the changes. you'll want to know what type of engine oil gives you a certain type of running temperature, and at what RPM, speed you hit max boost....etc. To me, the Exhaust temp is the most indicative of how the car is performing, 2ndly the OIL temp, then boost. but this is for another thread.

The Hirsch exhuast goes all the way from the rear to the front, with a bend upwards to match the DP. The stock DP is at most, a foot long.

1stly, Maptun and nordic are using ferrita downpipes custom made for their use. they have 2 versions, the single and double cat DPs. The software is tuned to work with that type of DP. 2ndly, the DP that they have is from the Turbo, all the way to the middle of the car, just before the mid box. From there, its where the 2.5" starts. this means that the hot gasses have travelled a longer way, free-er flowing and cooled down somewhat, before it gets to the 2.5" portion. this helps greatly with the mid-range torquey punch the guys get when they change the exhuast system. and the high end, 140kmh and beyond, is so much easier. it crosses 200kmh easily, both on the tuned linear and 210hp Aero.


for your last question, you might not need to play with the O2 sensor, if you have someone, nordic.maptun or a specialist tuner to work with your car and adjust the values of sensitivity for the O2 sensor. I am not sure if BSR does that cause they have tonnes of cars to work with, and sending out a guy to specially custom tune a car may not be in their business plan. As for Nordic, I have seen first hand that they do these things, and their customers are very appreciative of it. If I am not wrong, SQR also does have customisation feature. Check them out.

If your car is still stock, all you're going to get is a good free flowing exhuast, cooler engine, much better high end, some loss of low end pick up. you might gain 3-5hp max (in my opinion) but it will be better for your engine to breath. after that is done, change out your stock paper air filter for a JR or K&N one, make sure its not that oily, and you'll find an even bigger difference.

This is just maybe 10-20% of the electric/pressure cut out exhaust performance gain that someone else asked about, but with a whole lot less noise.

This is just sharing my experience with you. I hope that you guys have benefitted from it. I really hope that the US ECU type owners are open about it that these mods do work with other cars and not cause all sorts of problems that is read here.
 
1 - 10 of 10 Posts
Top