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, 20178 yr by braudi85

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, 20178 yr by ferret

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 :/

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

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, 20178 yr by Mike104