braudi85 Posted September 21, 2017 Share Posted September 21, 2017 (edited) Hey guys, I need some help with my full exhaust setup. I am trying to make it bolt on in 3ish pieces: header, cats, and catback (2 pieces). I'm going bolt on to avoid any welding as I have a limited budget. My current exhaust is rusty and the previous owner replaced the flanged with pipes and added a welded in flexpipe which has failed with a gnarly crack/leak. What I'm buying: Inferno Fabrications single port uel header (2.25") OBX catback (2.25") made for the 1998-2001 Impreza RS. What I am looking to buy/have found: Aftermarket catalytic converter (1 piece) made to fit in 2.5L (1997-2005 Legacys, Foresters, Outbacks, and 2.5L Impreza's). Does anyone know the inlet/outlet diameter size of these catalytic converters or what size donuts or flanges to use? I've been searching on many forums (here,nasioc, rs25, and a few others) but can't seem to find an answer. Any input would be appreciated. Edited September 21, 2017 by braudi85 Link to comment Share on other sites More sharing options...
ferret Posted September 21, 2017 Share Posted September 21, 2017 (edited) Not certain of this will fit the 98 or not, but I have used 3 of these to date. First was over 2 years ago without any failures. Only shortcoming is the smaller diameter nuts they send to use with the springs/donut flange end, Comes with 5 year warranty. So far very pleased. About $130 and $20 for shipping .... out of Canada,,,,, and shipping was very prompt. http://www.ebay.com/itm/2000-2005-Subaru-Outback-2-5L-Direct-Fit-Catalytic-Converter-with-Gaskets-/253163659384?hash=item3af1bae078:g:4cUAAOSwn-tZKdir Edited September 21, 2017 by ferret Link to comment Share on other sites More sharing options...
braudi85 Posted September 23, 2017 Author Share Posted September 23, 2017 Not certain of this will fit the 98 or not, but I have used 3 of these to date. First was over 2 years ago without any failures. Only shortcoming is the smaller diameter nuts they send to use with the springs/donut flange end, Comes with 5 year warranty. So far very pleased. About $130 and $20 for shipping .... out of Canada,,,,, and shipping was very prompt. http://www.ebay.com/itm/2000-2005-Subaru-Outback-2-5L-Direct-Fit-Catalytic-Converter-with-Gaskets-/253163659384?hash=item3af1bae078:g:4cUAAOSwn-tZKdir Ferret, thanks for the reply! Unfortunately here in New York, my car has to use a CARB compliant cat, otherwise I would buy this one! Sellers don't even ship them here even if they're not CARB compliant :/ Link to comment Share on other sites More sharing options...
Mike104 Posted September 23, 2017 Share Posted September 23, 2017 Walker gasket for front side of Cat is 31388 Port Size is 2" bolt hole center to center is 3.340" http://www.walkerexhaust.com/catalog/walker-exhaust-systems/e-catalog-lookup/31388 Walker Donut for aft side of Cat is 31614 Inside is 1.9" and OD is 2.6" http://www.walkerexhaust.com/catalog/walker-exhaust-systems/e-catalog-lookup/31614 Click on Tech Specs Tab when at link to verify sizes Link to comment Share on other sites More sharing options...
Mike104 Posted September 23, 2017 Share Posted September 23, 2017 (edited) If you are looking to cut costs why not just replace the system with a kit from Rock Auto Everything but the cat $186 + Shipping http://www.rockauto.com/en/moreinfo.php?pk=5943225&cc=1317333&jsn=353 Originally your car came with a two piece cat Front CARB compliant: $220 http://www.rockauto.com/en/moreinfo.php?pk=6594836&cc=1317333&jsn=364 Rear CARB compliant: $211 http://www.rockauto.com/en/moreinfo.php?pk=6595176&cc=1317333&jsn=362 I don't know if the one-piece will fit $235 http://www.rockauto.com/en/moreinfo.php?pk=4306395&cc=1359390&jsn=401 Edited September 23, 2017 by Mike104 Link to comment Share on other sites More sharing options...
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