2.5" or 3" exhaust? Any comments? [Archive] - SaabCentral Forums

: 2.5" or 3" exhaust? Any comments?


Saba
25th April 2004, 10:11 AM
Looking at what is available for the 9-3ss it seems that 2.5" is the flavour of the month. I can get a custom 3" system for a little bit more than the cost of importing a BSR, Ferrita or Jetex system (2.5"). Any comments of the difference between a 3" or a 2.5" on the SS?

ctrlz
25th April 2004, 06:36 PM
Saba, you see a lot more potential in this engine than I do!

Personally, I think you should consider porting and polishing the head, shaving it down, then grinding your own high lift cam before you spend $$$ on 3" pipes. You also got the catalytic converter and exhaust manifold to contend with.

I like M4Gunner's idea of going to 2.5", getting a less restrictive cat, and modifying the post-cat oxygen sensor. I say take the cost difference between the 3" and 2.5" system, and get a converter which flows more freely (may be a custom piece). Use an O2 sensor simulator behind the new cat.

Standard methodology--- talk to your exhaust guy, and figure out what the MOST restrictive part of the system is. For PERFORMANCE enhancement, THAT'S your starting point. Everything else is just NOISE!

If you find someone willing to do the custom cat work, get in touch with me. Maybe we can get a bulk discount. I'll combine it with my next Wicked Weasel order for the little lady, and save on the Air Mail :wink: That may require a short trip to NSW on your part, but by then your 9-3 will be SO MUCH FASTER :o

M4Gunner
26th April 2004, 01:56 AM
Saba, the only thing ill remind you of is the 2.25 factory exhaust. the general rule of thumb is not to go more than a half inch bigger than factory. however, you know rules of thumb... they dont always apply. just thought you should know if you didnt already. 8)

Saba
26th April 2004, 09:18 AM
Saba, you see a lot more potential in this engine than I do!

Personally, I think you should consider porting and polishing the head, shaving it down, then grinding your own high lift cam before you spend $$$ on 3" pipes. You also got the catalytic converter and exhaust manifold to contend with.

I like M4Gunner's idea of going to 2.5", getting a less restrictive cat, and modifying the post-cat oxygen sensor. I say take the cost difference between the 3" and 2.5" system, and get a converter which flows more freely (may be a custom piece). Use an O2 sensor simulator behind the new cat.

Standard methodology--- talk to your exhaust guy, and figure out what the MOST restrictive part of the system is. For PERFORMANCE enhancement, THAT'S your starting point. Everything else is just NOISE!

If you find someone willing to do the custom cat work, get in touch with me. Maybe we can get a bulk discount. I'll combine it with my next Wicked Weasel order for the little lady, and save on the Air Mail :wink: That may require a short trip to NSW on your part, but by then your 9-3 will be SO MUCH FASTER :oOh jeez forget about exhausts I've just been on the Wicked Weasel site :o :o :o :o Nice knickers and bikinis
http://wickedweasel.com/

Saba
26th April 2004, 09:19 AM
Saba, the only thing ill remind you of is the 2.25 factory exhaust. the general rule of thumb is not to go more than a half inch bigger than factory. however, you know rules of thumb... they dont always apply. just thought you should know if you didnt already. 8)No I didn't already know. Although I think I have heard that somewhere before come to think of it.

M4Gunner
26th April 2004, 01:59 PM
mmMMMMmmmm...wickedweasel...

lovestowrite
15th October 2005, 02:35 AM
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ctrlz
15th October 2005, 08:57 AM
Why donít you try diversifying your bikini (http://www.moreswimsuits.com/) viewing a little?
Been there, done that:cheesy:
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http://www.alsbikinis.com/

Deli-Llama
16th October 2005, 04:09 AM
I can get a custom 3" system for a little bit more than the cost of importing a BSR, Ferrita or Jetex system (2.5").
Either you're getting the imported system at a really good price or you're being over charged for a custom built 3" system. I know you're in WA but you might want to give Hi-Tech Mufflers (02 9332 3524) a call.