09-30-2007, 03:16 AM
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#1
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Registered User
Join Date: Jun 2007
Location: "The Steel City" PA
Posts: 15
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True or False???
Question. I was told by a 18 year Porsche Master Tech. that if I remove the 2nd set of cats on my 2000 Porsche Boxster S that the check engine light will come on.
Can this really be ture?
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09-30-2007, 04:30 AM
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#2
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Registered User
Join Date: Aug 2005
Location: Sanford NC
Posts: 2,570
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Just disconnect the front O2 sensors and find out.
Really think you are going to gain that much HP with just an exhaust tweak?
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09-30-2007, 05:37 AM
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#3
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Registered User
Join Date: Jun 2007
Location: Littleton, CO
Posts: 456
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Not sure about the Boxster, but this can be true with other cars. I think some of it depends on whether or not there are O2 sensors after the 2nd cat.
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"Of all the extreme sports I've ever participated in- windsurfing, kite boarding, wake boarding, tow-in surfing and snowboarding- skiing, for me, made everything else easy."
-Chuck Patterson
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09-30-2007, 06:24 AM
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#4
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Registered User
Join Date: Aug 2005
Location: orange county, ca
Posts: 248
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True, it is mainly because of the disconnected 2nd 02 sensor.
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09-30-2007, 09:27 AM
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#5
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Registered User
Join Date: Jan 2007
Location: Depends on the day of the week....
Posts: 1,400
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On the Boxster, the secondary O2 sensors are after the pre-cats i the headers, not the secondary cats. The car cannot tell if the secondary cats have been removed.
Patrick
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09-30-2007, 12:55 PM
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#6
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Registered User
Join Date: Sep 2007
Location: Honolulu
Posts: 18
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Your 18 years of experience (or is it 18 years old) Porsche Master Mechanic is wrong. The O2 sensors are on the header cats (1st set) like bmwm750 stated. No way for a CEL to come on.
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09-30-2007, 05:41 PM
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#7
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Registered User
Join Date: Oct 2005
Location: Seattle
Posts: 352
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This is absolutely false. I took the secondary cats off over a year ago and have driven thousands of miles on and off the track. No CEL. This really isn't something to do to gain HP as you will never notice the difference but it will alter the tonal quality of the exhaust which can be just as rewarding as a few HP.
__________________
2000 Black Boxster S
EVO Intake & GIAC Tuning
Headers & Porsche Sport Exhaust System
ROW M030 Suspension
Front & Rear Strut Braces
B&M Short Shift & EVO Billet Linkage
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09-30-2007, 05:44 PM
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#8
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Registered User
Join Date: Jul 2006
Location: lex
Posts: 213
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Porsche Master Tech... don't always trust those words...
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10-01-2007, 03:23 AM
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#9
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Registered User
Join Date: Jul 2007
Location: florida
Posts: 111
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Quote:
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Originally Posted by easyc
Porsche Master Tech... don't always trust those words...
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hahaha... how tru, how tru....
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10-01-2007, 05:47 AM
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#10
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Registered User
Join Date: Jun 2004
Location: Des Moines, IA
Posts: 8,083
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The tree huggers will find you and key your car.
BEWARE! 
__________________
Rich Belloff
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10-01-2007, 05:48 AM
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#11
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Registered User
Join Date: Jun 2004
Location: Des Moines, IA
Posts: 8,083
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Do you have emissions testing in PA? If so, wouldn't you fail without the second cats? 
__________________
Rich Belloff
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10-01-2007, 09:08 AM
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#12
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Registered User
Join Date: Nov 2006
Location: central PA
Posts: 165
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MOST of the counties in PA have emmissions. With the exception of a few, however, they're visual only. So a lot of cars like these can get away with "Yep, there are still cats on it!" as long as the mechanic doesn't know it's supposed to have two 
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10-01-2007, 12:26 PM
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#13
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Registered User
Join Date: Jan 2007
Location: Texas
Posts: 1,311
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I don't get it. Aren't there 4 sets of O2 sensors on each sets of cats? Right. The 2 on the 1st set which are located on the headers and the 2nd set which are on the down-pipe just before the exhaust. So that makes a total of 4! As long as you keep the 1st set with the headers that use a bung hole for the O2 sensors the cell should not come on. The second set of cats also uses O2 sensors, and if you were to buy an after market set of by-pass pipes they would still need the bung holes for the sensors. So maybe the Porsche master tech thought the removal meant the sensors too, and not just the cats.
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10-01-2007, 02:04 PM
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#14
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Registered User
Join Date: Oct 2005
Location: Seattle
Posts: 352
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Quote:
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Originally Posted by porsche986spyder
The second set of cats also uses O2 sensors
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On a 2000 S, this is not accurate. There are (on each side) two O2 sensors. One before the primary cat on the header and one directly after it, also on the header. There are no other O2 sensors.
__________________
2000 Black Boxster S
EVO Intake & GIAC Tuning
Headers & Porsche Sport Exhaust System
ROW M030 Suspension
Front & Rear Strut Braces
B&M Short Shift & EVO Billet Linkage
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