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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2000 Chevy Blazer ZR2
Performance: AEM intake, TB mod, CRMB custom y-pipe w/precat deleted, 3in catco cat, 2.5in exhaust w/ Flowmaster 40 DF,
March pulleys, MSD SF ignition, Taylor 8.2mm wires
Suspension: Knaffle 1.5in lift shackles, 1.25in rear wheel spacers, 31in BFG AT's
Exterior: black bowties, bug guard, vent visors
Interior: Pioneer speakers, Scanguage II

http://www.cardomain.com/ride/3013891

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

__________________
Remember proper testing gives us the answer to many problems.
MT

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.

__________________
2000 Chevy Blazer ZR2
Performance: AEM intake, TB mod, CRMB custom y-pipe w/precat deleted, 3in catco cat, 2.5in exhaust w/ Flowmaster 40 DF,
March pulleys, MSD SF ignition, Taylor 8.2mm wires
Suspension: Knaffle 1.5in lift shackles, 1.25in rear wheel spacers, 31in BFG AT's
Exterior: black bowties, bug guard, vent visors
Interior: Pioneer speakers, Scanguage II

http://www.cardomain.com/ride/3013891

MT-2500

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