01-04-2014, 01:17 PM
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#1
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Registered User
Join Date: Nov 2013
Location: Colorado
Posts: 442
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Cat bypass pipes
Has anyone installed Cat bypass pipes? I see the O2 sensors are located at both the intake and outlet sides of the CATs?
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01-05-2014, 07:15 PM
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#2
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I am my own mechanic....
Join Date: Feb 2013
Location: Salt Lake City, UT
Posts: 3,433
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Quote:
Originally Posted by jdlmodelt
Has anyone installed Cat bypass pipes? I see the O2 sensors are located at both the intake and outlet sides of the CATs?
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Rear cat bypass pipes?
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'08 VW Touareg T-3 wife's car
'13 F150 Super Crew long bed 4x4 w/ Ego Boost
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01-08-2014, 05:49 PM
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#3
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Registered User
Join Date: Nov 2013
Location: Colorado
Posts: 442
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Quote:
Originally Posted by Timco
Rear cat bypass pipes?
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Mine is a 99 2.5l is there more than one set?
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01-08-2014, 06:08 PM
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#4
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Registered User
Join Date: Nov 2008
Location: Massachusetts
Posts: 4,810
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Quote:
Originally Posted by jdlmodelt
Mine is a 99 2.5l is there more than one set?
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If you delete the only set of cats on a 2.5, needless to say, the vehicle will be rendered non-emmisions compliant, along with CEL's.
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01-08-2014, 08:04 PM
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#5
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Registered User
Join Date: Nov 2013
Location: Colorado
Posts: 442
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Quote:
Originally Posted by Johnny Danger
If you delete the only set of cats on a 2.5, needless to say, the vehicle will be rendered non-emmisions compliant, along with CEL's.
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My Honda Civic didn't throw any codes when I tried a bypass. Are you saying the 2.5l will throw codes?
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01-08-2014, 08:24 PM
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#6
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Registered User
Join Date: Nov 2008
Location: Massachusetts
Posts: 4,810
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Quote:
Originally Posted by jdlmodelt
My Honda Civic didn't throw any codes when I tried a bypass. Are you saying the 2.5l will throw codes?
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Since the 2.5 only has one set of cats, unless you remap the ECU, it will not only trigger a CEL, but it will cause the vehicle to fail emissions/inspection.
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Don't worry … I've got the microfilm.
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01-08-2014, 08:46 PM
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#7
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Registered User
Join Date: Oct 2012
Location: Denver
Posts: 54
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I have straight pipes on my 97 2.5 race car. It will almost definitely throw a CEL if you remove the cats and it will fail emissions.
For a street car you aren't going to gain much by pulling the cats, you will probably lose some low end torque in exchange for some top end HP, not a good trade off unless you are WOT all the time.
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01-09-2014, 07:43 AM
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#8
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Registered Boxster abuser
Join Date: Oct 2011
Location: socal
Posts: 1,014
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Quote:
Originally Posted by jdlmodelt
My Honda Civic ....
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01-10-2014, 10:45 AM
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#9
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Registered User
Join Date: Dec 2013
Location: Chicago
Posts: 141
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Quote:
Originally Posted by healthservices
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My first car was a 99 Mitsubishi Eclipse, what about you guys? 
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Black on Black 2001 Boxster Base
Clutch Masters Stage III Clutch
Luk Flywheel // IMS Retrofit // Rear Main Seal
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01-12-2014, 05:54 AM
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#10
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I am my own mechanic....
Join Date: Feb 2013
Location: Salt Lake City, UT
Posts: 3,433
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Quote:
Originally Posted by alanqning
My first car was a 99 Mitsubishi Eclipse, what about you guys? |
'77 Pinto wagon.
__________________
'04 Boxster S 50 Jahre 550 Spyder Anniversary Special Edition, 851 of 1953, 6-sp, IMS/RMS, GT Metallic silver, cocoa brown leather SOLD to member Broken Linkage.
'08 VW Touareg T-3 wife's car
'13 F150 Super Crew long bed 4x4 w/ Ego Boost
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01-12-2014, 08:54 AM
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#11
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Registered Boxster abuser
Join Date: Oct 2011
Location: socal
Posts: 1,014
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73 Opel Gt!
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01-12-2014, 12:24 PM
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#12
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Registered User
Join Date: Sep 2013
Location: Chandler, AZ
Posts: 1,796
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68 mercury Cougar with 230,000 miles. Needless to say I ended up rebuilding the car. When you are a kid with some skills and little money you work with what you got. Made fats in a straight line but never handled for much even thought I did do some suspension work.
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03 Carrera
02 Boxster S Guards Red, black interior with matching hardtop
89 Carrera 4
89 944 S2
78 911SC
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01-17-2014, 09:14 AM
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#13
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Registered User
Join Date: Dec 2012
Location: FL
Posts: 4,143
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Quote:
Originally Posted by Timco
'77 Pinto wagon.
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Me too, late 70's turd brown pinto wagon with no ac in fl. Then a 77 turd brown Buick lesabre... My parents loved turd brown apparently. First car I bought with my own money, a red fiat x1/9 for $500. It needed some work...
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