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10-28-2008, 12:47 AM
| #1 |
| Banned Join Date: Oct 2008
Posts: 462
 | Z71 exhaust question need help i have a 92 z71 with 350... i want to cut in front of converter and put a straight pipe a dual chamber muffler then a turndown will this work or will i have problems with o2 sensor reading wrong and truck running rich or lean? |
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10-28-2008, 05:28 AM
| #2 |
| Senior Member Join Date: Aug 2008 Location: williamsburg virginia
Posts: 183
| a 92 i believe only has the o2 sensor on or close to your manifold which is before your converter.there shouldnt be any problems until its time for your inspection. it wont pass. |
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10-28-2008, 08:23 AM
| #3 |
| Senior Member  Join Date: Mar 2008 Location: N.Y.
Posts: 4,300
 | it will depend on how free flowing the new system is, You need a certain amount of back pressure to make the o2 work correctly, that and inspection is why people cut behind the cat
__________________ 4 wheels move the body 2 wheels move the soul B.W.A.I |
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10-28-2008, 09:20 AM
| #4 | |
| Senior Member Join Date: Dec 2007
Posts: 547
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10-28-2008, 09:57 AM
| #5 |
| Banned Join Date: Oct 2008
Posts: 462
| yeah the only sensor i seen is on manifold on driver side... i ordered a thrust dual chamber muffler i am prob gonna just put a 4ft. piece of pipe the muffler and a 14in. turndown |
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10-28-2008, 09:58 AM
| #6 |
| Banned Join Date: Oct 2008
Posts: 462
| and i live in the middle of nowhere in south mississippi its just a hunting truck no inspections |
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10-28-2008, 12:53 PM
| #7 |
| Senior Member  Join Date: Oct 2008 Location: Northern Michigan
Posts: 1,177
| I have the same truck and I have no cat just a broken glasspack and 3" strait exhaust with a 90d turn and a turndown behind the rear tire and the O2 sensor works fine I just get super sh**ty gas mileage! I've also ran just the ypipe no mufflers or anything and then the mileage really suffered and the truck ran like sh*t so back pressure isn't a real big deal on this truck but you do need some! Putting a dual chamber muffler on will give you more then enough back pressure plus I'm not sure what it's like in Miss. but I got $70 for my cat at the local steel recycling yard so don't just throw it away it may be worth some money!! |
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10-28-2008, 12:58 PM
| #8 |
| Senior Member Join Date: Jul 2008 Location: Mississippi
Posts: 144
| A cheap fix that'll help with the o2 sensor is an extender on the 02 to remove it from the direct exhaust flow. I have an 89 tbi 350 in Frankenstien with headers, 2.5" dual exhaust and Cherry Bomb glasspacks. We spaced my o2 bung using a 1/2" spacer between it and the header and it works great. I havn't had a problem with mine running rich at all since I got it running. What part of MS are you from?
__________________ Chevyracer8262  |
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10-28-2008, 04:37 PM
| #10 |
| Banned Join Date: Oct 2008
Posts: 462
| thanks for all the advice and i from greene county |
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| Tags |
| cat, exhaust, muffler, o2 sensor |
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