The problem Tom (svxfiles) and I found with the Magnaflow 94037 cat (OBDII) was that the O2 sensor bung was located at the FRONT of the cat. The stock converter had the O2 sensor located at the REAR of the cat.
In the front location, the O2 sensor would not get as clean a reading. Plus the location makes it a real pain to get to if you need to replace the O2 sensor. See photo:
To solve these two problems on my 1996 OBDII Polo, We used a Magnaflow 94007 converter (exactly the same as the 94037, but without the third O2 bung
We then welded an O2 sensor bung into the side of the exhaust pipe, directly behind the converter. Cleaner reading at the rear of the converter and a lot easier to change if necessary. We did have to lengthen the O2 wiring to account for the increased length needed. We did this at the permanent wiring, not the O2 sensor wiring.
No problems whatsoever.
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Subaru Ambassador
1996 Polo Green LSi #216 ..138,100 miles. ..SOLD
JFICX8659TH100216.....Date of Manufacture: November 16, 1995.....
Fuji Heavy Industries..Ōta North Plant....Ōta City,. Gunma Prefecture, Japan
In-Service Date: January 2, 1997
"The Pristine Green Polo Machine”
First Polo Green on the Network
First Clear front turn signals, JDM Alcyone hood emblem, rear panel, and BOXER engine cover on the Network (US) (2000)
First 5000K HID factory fog lights (2007)
First SVX JDM BBS wheels on a USDM SVX (2013)
HID lighting (5000K) for headlight and H3 fog lights, PIAA SuperExtreme 120W high beams, rebuilt EG33 longblock, Cometic head gaskets, Phase II flexplate, AMR aluminum radiator with custom silicone hoses, 160A high-output alternator in aluminum-ceramic coated case, new design alternator wiring upgrade v.4, rare factory headlight protectors, refinished JDM BBS mesh aluminum wheels and custom, polished billet aluminum new hex center caps, LED grille mod, R1 Concepts high-carbon cryo slotted rotors, Akebono ceramic pads, Goodridge S/S braided brake lines, Smallcar Stage 1 shift kit, ThermalTech aluminum/ceramic-coated valve covers, Energy Suspension urethane front & rear swaybar bushings, Bontrager22 rear swaybar with QS Components Chromoly Teflon/Kevlar endlinks, "$15.00/5 minute" suspension mod. Hella Supertone horns, Custom stainless steel exhaust system with 2" headpipes, Magnaflow cats, AeroTurbine AR25 resonator /AWD "Bullet" muffler.
R.I.P. 2010 Subaru Outback Limited 2.5 CVT...338,000 miles. Totaled by a 1,300 lb. COW March 4, 2016 
2014 Hyundai Avante Limited ...178,000 miles. Actually quieter and smoother than the Outback 
2007 Mazda Miata MX-5 PRHT...102,000 miles.
Plenty of parts, service and windshields. 
4th Registered Network member —2/21/2001
My NEW locker..I...My Email..I..Wikipedia/SVX .
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Last edited by svxcess; 09-05-2007 at 06:22 AM.
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