Has anyone E-tested their car after removing the pre-cats?
 

Just wondering if anyone has done an e-test/smog test/whatever it's called in your region, on their car after removing the pre-cats and replacing them with something that isn't a catalytic converter (ie: AR20 resonators, glasspacks, straight pipes, etc.) Our engines are reasonably clean burning and I would imagine that a single Magnaflow 2-1 main cat should be enough to pass the testing.

Anyone have any experience/info in this regard?

Re: Has anyone E-tested their car after removing the pre-cats?
 

I would have to agree with you. The magnaflow 2into1 should do the job. But that's purely speculation.

Re: Has anyone E-tested their car after removing the pre-cats?
 

I passed nj state emissions with straight pipes welded where the pre cats were. upon visual inspection they asked what WAS there and I told them I didn't know...Assumed there was a rusted out hole they patched;)

Re: Has anyone E-tested their car after removing the pre-cats?
 

Harry Newman "newsvx" removed the two pre cats in his 92 pearlie.After fabricating 2" headpipes, he replaced them with Aeroturbine AR20 resonators into a Magnaflow 94007 High-flow cat and had no emission problems or codes that I know of.



I did exactly the same thing on my 96 Polo. New 2" headpipes, AR20 resonators into a Magnaflow 94037 High-flow cat (with third 02 sensor bung)


I kept getting a check engine light for a OBDII code 420, which showed "Catalyst System Efficiency Below Threshold". I assumed the main cat alone was not strong enough to handle the stricter system requirements of OBDII once the pre-cats were removed.

I took off the front AR20s and replaced them with Magnaflow cats and have not had a problem since. Passed emmissions with flying colors and never another CE light.

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Re: Has anyone E-tested their car after removing the pre-cats?
 

Being OBD1 I'm not worried about the CE light, but that's useful to know. What cats did you end up using? I'd thought about the Magnaflow 50004, but as far as I know it's been discontinued. Summit Racing still lists it on their site, but places I've called no longer stock it.

Edit: A quick search on the Magnaflow site turned up their 2" cat, P/N 54904, which looks like it would be the ideal replacement for the OEM pre-cats. It's the same shape and probably similar dimensions, perhaps a hair longer. I like the offset design because it should allow for maximum ground clearance.