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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 by braudi85

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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 by ferret

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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 :/

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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

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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 by Mike104

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