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09-21-2006, 03:25 PM
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#1
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GM S-Series Mod
Join Date: Aug 2005
Location: Westminster, Maryland
Posts: 2,609
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How restrictive is the small resonator on a 2000 jimmy/blazer?
while i was getting my new truck ready for inspection, i noticed the exhaust on these newer trucks has a small resonator just before the cat. my question is how restrictive is this? If i cut it off and just put a piece of pipe in its place, would it affect anything like the O2 sensor readings?
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2000 Chevy Blazer ZR2 
Performance: AEM intake, TB mod, ported stock y-pipe w/precat deleted, 3in catco cat, 2.5in Flowmaster 40 DF,
March pulleys, MSD SF ignition, Taylor 8.2 wires, Transgo shift kit, Corvette servos, B&M trans cooler.
Suspension: Knaffle 1.5in lift shackles, 1.25in rear wheel spacers, 31in BFG AT's
Exterior: custom ZR2 decals, bug guard, vent visors
Interior: Lanzar headunit w/ ipod input, Pioneer speakers, Scanguage II
http://www.cardomain.com/ride/3013891
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09-21-2006, 05:16 PM
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#2
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AF - Advisor
Join Date: Sep 2005
Location: New London, Missouri
Posts: 12,209
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Re: How restrictive is the small resonator on a 2000 jimmy/blazer?
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Originally Posted by ZL1power69
while i was getting my new truck ready for inspection, i noticed the exhaust on these newer trucks has a small resonator just before the cat. my question is how restrictive is this? If i cut it off and just put a piece of pipe in its place, would it affect anything like the O2 sensor readings?
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That is a new twist on things. I have not run nto it.
Could it be a pre cat?
Any 02 sensors befor or after it.
What engine and transmission?
MT
__________________
Remember proper testing gives us the answer to many problems.
MT
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09-21-2006, 06:55 PM
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#3
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GM S-Series Mod
Join Date: Aug 2005
Location: Westminster, Maryland
Posts: 2,609
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Re: How restrictive is the small resonator on a 2000 jimmy/blazer?
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Originally Posted by MT-2500
That is a new twist on things. I have not run nto it.
Could it be a pre cat?
Any 02 sensors befor or after it.
What engine and transmission?
MT
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yea other people have mentioned a resonator on the new trucks so i guess that is it. its a small canister about 5-6in long at the bottom of the y-pipe before the cat. engine is the 4.3 vortec csfi w/ auto trans. there is 1 O2 in the y-pipe on the drivers side and 1 O2 after it but before the cat.
__________________
2000 Chevy Blazer ZR2
Performance: AEM intake, TB mod, ported stock y-pipe w/precat deleted, 3in catco cat, 2.5in Flowmaster 40 DF,
March pulleys, MSD SF ignition, Taylor 8.2 wires, Transgo shift kit, Corvette servos, B&M trans cooler.
Suspension: Knaffle 1.5in lift shackles, 1.25in rear wheel spacers, 31in BFG AT's
Exterior: custom ZR2 decals, bug guard, vent visors
Interior: Lanzar headunit w/ ipod input, Pioneer speakers, Scanguage II
http://www.cardomain.com/ride/3013891
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09-22-2006, 08:42 AM
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#4
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AF - Advisor
Join Date: Sep 2005
Location: New London, Missouri
Posts: 12,209
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Re: How restrictive is the small resonator on a 2000 jimmy/blazer?
Quote:
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Originally Posted by ZL1power69
yea other people have mentioned a resonator on the new trucks so i guess that is it. its a small canister about 5-6in long at the bottom of the y-pipe before the cat. engine is the 4.3 vortec csfi w/ auto trans. there is 1 O2 in the y-pipe on the drivers side and 1 O2 after it but before the cat.
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I am not real sure about it but it maybe a pre\small cat.
You might check the parts book and see what it says about it.
Unless you have to much back preasure I would not replace it.
If you find out for sure what it is let us know.
Good Luck
MT
__________________
Remember proper testing gives us the answer to many problems.
MT
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