moto-m Posted September 6, 2012 Share Posted September 6, 2012 Does anyone know if part #'s 20010 and 20020 are additional catalytic converters or just resonators? My 1998 Pathy is California emissions and has these pipes instead of straight pipes like the federal emissions. I am doing an exhaust system and will probably leave them if they are just resonators. But if they are additional cats I may get rid of them to free up the system more. OEM they are like $800 compared to around $300 for the fed emissions pipes so it makes me think they are cats, which sucks. Link to comment Share on other sites More sharing options...
Towncivilian Posted September 6, 2012 Share Posted September 6, 2012 (edited) Resonators. Does deleting cats really "free up" anything? The ECU expects those cats there and performance probably wouldn't increase if they were removed, I would think. You'll also get a constant CEL. Edited September 6, 2012 by Towncivilian Link to comment Share on other sites More sharing options...
pathfounder Posted September 6, 2012 Share Posted September 6, 2012 Cats flow almost as well as straight pipe nowadays. May not be true in 1998. Those are resonators. Link to comment Share on other sites More sharing options...
moto-m Posted September 6, 2012 Author Share Posted September 6, 2012 Resonators. Does deleting cats really "free up" anything? The ECU expects those cats there and performance probably wouldn't increase if they were removed, I would think. You'll also get a constant CEL. The 2nd oxygen sensor is before these so I don't see how it could throw a CEL. Link to comment Share on other sites More sharing options...
Towncivilian Posted September 6, 2012 Share Posted September 6, 2012 I misread and thought you were getting rid of the cats too, my bad. Link to comment Share on other sites More sharing options...
moto-m Posted September 6, 2012 Author Share Posted September 6, 2012 Since the consensus seems to be they are resonators, I think I will keep it simple and cheap. Gonna swap the muffler at the inlets and get rid of the single rear resonator. Link to comment Share on other sites More sharing options...
moto-m Posted September 6, 2012 Author Share Posted September 6, 2012 Would it be easier to go with 2" or 2.25" inlets on the muffler? I am thinking 2" cause the stock is pipe is around 1 7/8" correct? I know exhaust systems have been discussed and I have read through previous threads but still not sure of the answer. Link to comment Share on other sites More sharing options...
moto-m Posted September 7, 2012 Author Share Posted September 7, 2012 Actually looks like the stock tubing is 1.75". Think I will go with the Magnaflow 12280 which has dual 2" and single 2.5". Link to comment Share on other sites More sharing options...
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