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Re: Eliminate pre-cat sections. Bad idea?
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Originally Posted by SVX Maxximus
I will plan to do 2" off the headers, including the O2 sensors. Then into AeroTurbine AR20 resonators, with more 2" into the main cat. What diameter pipe comes off the main cat headed towards the resonator before the muffler? I would need a Main Cat with that diameter single outlet, and the 2" inlets. Any model suggestions? Is there an O2 sensor on the Main Cat, giving our cars 3 of them? Thanks!
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The pipe that comes out of the rear of main cat, into athe resonator and all the way back to the rear muffler is 2.5"
The main cat you would need is the Magnaflow 94007, It has dual 2" inlets and a single 2.5" outlet. The 1992 SVX only has the 2 O2 sensors in the headpipes.
The third O2 sensor in the main cat did not show up until OBDII in 1996. That cat would be the 94037 (with the O2 bung)
The stock resonator has been known to fail quite oftenand have broken baffles with age, causing a buzzing or rattling under acceleration about 2500-3000rpm.
The option I used was to replace it with the Aero Turbine AR25 resonator, which is the same inlet/outlet diameter (2.5") as the stock resonator. Welded into the same position as the stock one.
You can see my third O2 sensor mounted in the pipe behind the main cat. Gives a cleaner reading there and is much easier to change than at the top of the cat.
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Last edited by svxcess; 05-27-2009 at 09:42 PM.
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