05-29-2007, 07:29 PM
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#1
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Porscheectomy
Join Date: Mar 2006
Location: Seattle Area
Posts: 3,011
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Quote:
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Originally Posted by clb0099
he told me that if you put headers in you have to extend the 02 sensor wires but if i remove the the pre-cats and don't do headers it will not set off the cel light or engine light the guy i was talking to was a gilbert. No offense but why would he give me money back on advice . He said that the pre-cats restricted the air flow and if i removed them that i would gain more hp but he didn't sell me sports cats or anything just told me that it wouldn't set off the 02 sensors.
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He wasn't trying to sell you a set of headers? The cats are part of the exhaust manifold, unless you're doing a bunch of fabrication, the only way to remove the cats is with headers.
The car's computer is looking for a difference between the upstream and downstream O2 sensor signals. If they both read the same thing, it'll throw a check engine light so I assume he's telling you to place the second sensor after to second cat? More fabrication.
Last edited by blue2000s; 05-29-2007 at 08:26 PM.
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05-30-2007, 06:47 AM
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#2
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Registered User
Join Date: Jun 2004
Location: Des Moines, IA
Posts: 8,083
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I believe that removing cats is illegal in NJ.
__________________
Rich Belloff
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05-30-2007, 06:59 AM
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#3
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Registered User
Join Date: Oct 2006
Location: MD
Posts: 447
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It is illegal, and you will also get a check engine light.
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05-30-2007, 07:20 AM
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#4
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Registered User
Join Date: Jan 2007
Location: Texas
Posts: 1,311
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2nd set, not first.
Hey guys, I believe that tech was speaking of the 2nd set part of the downstreem pipes with the Cats on them. NOT the set closest to the headers. EPIQ makes a set of these with bung holes for the sensors to still work and not throw off the computers settings. They say it will still pass emitions. Plus it's an easy bolt-on job, so you can always reverse it if needed. Yes, it is illegal on all states that I know of. But if you pass emitions, how could they tell unless they were underneath your car. Check out these pipes at EPIQ and read the discription.
http://www.epiqautosport.com/pro_boxster_secondary_catalytic_bypass_pipes.php
Last edited by porsche986spyder; 05-30-2007 at 09:43 AM.
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05-30-2007, 07:38 AM
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#5
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Registered User
Join Date: Sep 2006
Location: chicago
Posts: 3,510
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on my old car i took out my cars, wow was the sound diff. but the power was up a little bit too, but nothing major other than the sound.
illegal? yes, but who cares?
__________________
http://i34.tinypic.com/157yslk.jpg
"I couldn't find the sports car of my dreams, so I built it myself." ~F. Porsche
Gemballa springs::litronics::Eurotech 18s(275/225)::B&M::MOMO wheel::
exhaust cutouts::EVOcoldair intake::OEM smoked tails & sidemarkers::
colormatched bumperettes::Top Speed Pro-1 exhaust::
my cardomain/pictures page
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05-30-2007, 09:16 AM
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#6
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Registered User
Join Date: Sep 2006
Location: new jersey
Posts: 404
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porsche986spyder,
exactly what i was talking. Thank you i will be calling today .
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05-30-2007, 09:50 AM
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#7
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Porscheectomy
Join Date: Mar 2006
Location: Seattle Area
Posts: 3,011
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Quote:
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Originally Posted by clb0099
porsche986spyder,
exactly what i was talking. Thank you i will be calling today .
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Those aren't the pre cats. Precats are the ones nearest to the engine, as you stated in the first post.
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05-30-2007, 11:48 AM
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#8
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Registered User
Join Date: Jun 2004
Location: Des Moines, IA
Posts: 8,083
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Quote:
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Originally Posted by djomlas
on my old car i took out my cars, wow was the sound diff. but the power was up a little bit too, but nothing major other than the sound.
illegal? yes, but who cares?
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I care! Why don't you?
__________________
Rich Belloff
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05-30-2007, 12:49 PM
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#9
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Registered User
Join Date: Sep 2006
Location: chicago
Posts: 3,510
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Quote:
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Originally Posted by Brucelee
I care! Why don't you?
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why dont i care if taking the cats out is legal or not? is that what you are asking?
its illegal for me to drive with the front plate missing as well, i still do it. 
__________________
http://i34.tinypic.com/157yslk.jpg
"I couldn't find the sports car of my dreams, so I built it myself." ~F. Porsche
Gemballa springs::litronics::Eurotech 18s(275/225)::B&M::MOMO wheel::
exhaust cutouts::EVOcoldair intake::OEM smoked tails & sidemarkers::
colormatched bumperettes::Top Speed Pro-1 exhaust::
my cardomain/pictures page
Last edited by djomlas; 05-30-2007 at 12:51 PM.
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