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Old 08-27-2008, 04:19 PM   #1
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Race exhaust without catalysts.

Race exhaust without catalysts.
I am going to upgrade my 9-5 aero (05MY or maybe I will get 06MY later) to the stage 3 or 3+ for beginning, and maybe up to the stage 7+, but in future.
The first thing I would like to decide, which exhaust do I need?
The first and easiest way to get some complete 3 inch with race cats (as far as I know there are 2 catalysts on 9-5).
The second way I want to try is to install cat free exhaust. It will cost me less and I think it will increase power even better, then the system with race cat. Also I suspect that I will get better fuel economy. So I got some questions.
1) Will 9-5 work well without cat? I am going to ask the tuner I chose to fix me the special software for this.
2) Will second O2 sensor work? Or shall I just remove it?
3) Will removing the mufflers give me some more power?
Any minds? Has anyone got such exhaust? Please don’t discus ecology and exhaust noise here. I know it is bad and loud, but still want to try it.
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Old 08-27-2008, 07:16 PM   #2
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im running my exhaust without any pipe/mufflers after the cat and its loud but im also making 15-16 psi steady at WOT now instead of the 13 i was making. ('01 9-5 aero) no software, just k&n and forge bpv. it needs a little more backpressure though im guessing because it doesnt seem very much faster.
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Old 08-28-2008, 05:24 AM   #3
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With proper tuning and a decent quality catalyst it will not be a problem on any power attainable with that turbo. Until I got closer to 500hp with my Vig the cat was only a tiny problem.
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2.0 GOOSE 500whp + 8500rpm = 11.06 @125 E85
Viggen 439whp / 447tq 12.43 @114 on Gt2871.64, (Now 511whp Gt3076)
Nordic E85 9-3 SS Aero 320hp / 350ftlbs
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Old 08-28-2008, 07:43 AM   #4
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Will cat free system increase fuel economy?
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Old 08-29-2008, 03:19 PM   #5
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Quote:
Originally Posted by kurwa311 View Post
Will cat free system increase fuel economy?
Not worth it.

Not a whole lot you can do to turbo'd cars to increase fuel mileage.
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