Lt1 Header Opinions
09-27-2015, 08:27 PM
#1
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Lt1 Header Opinions
Recently bought a 97 z28 back in February with 98k on it and a terrible miss fire. After rebuilding the top end and replacing the wires and opti it finally runs strong. I am now getting into options for more power and headers are the first thing that came to mind considering I bought the car with a cat back on it. Just wanted some opinions and also what I should buy with the headers. (ex. y pipe)
Thanks
Thanks
09-27-2015, 09:41 PM
#3
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09-28-2015, 02:56 PM
#6
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Re: Lt1 Header Opinions
You going to install them yourself?
Where are you located, and what are the emissions requirements - tail pipe and visual, where you live? Do you plan to keep or delete: ...cat? ....EGR? .....AIR?
Shorties and mid-length typically come with a Y-pipe. Long tubes generally require separate purchase of the Y-pipe. Some headers come with gaskets and bolts, but it's a good idea to upgrade to better gaskets and ARP bolts.
Where are you located, and what are the emissions requirements - tail pipe and visual, where you live? Do you plan to keep or delete: ...cat? ....EGR? .....AIR?
Shorties and mid-length typically come with a Y-pipe. Long tubes generally require separate purchase of the Y-pipe. Some headers come with gaskets and bolts, but it's a good idea to upgrade to better gaskets and ARP bolts.
09-28-2015, 03:52 PM
#7
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Re: Lt1 Header Opinions
You going to install them yourself?
Where are you located, and what are the emissions requirements - tail pipe and visual, where you live? Do you plan to keep or delete: ...cat? ....EGR? .....AIR?
Shorties and mid-length typically come with a Y-pipe. Long tubes generally require separate purchase of the Y-pipe. Some headers come with gaskets and bolts, but it's a good idea to upgrade to better gaskets and ARP bolts.
Where are you located, and what are the emissions requirements - tail pipe and visual, where you live? Do you plan to keep or delete: ...cat? ....EGR? .....AIR?
Shorties and mid-length typically come with a Y-pipe. Long tubes generally require separate purchase of the Y-pipe. Some headers come with gaskets and bolts, but it's a good idea to upgrade to better gaskets and ARP bolts.
Last edited by Ks0209; 09-28-2015 at 03:55 PM.
09-28-2015, 07:32 PM
#8
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Re: Lt1 Header Opinions
A 97 has two cats, one on each bank. Still depends on what type emissions inspection you face. Long tubes relocate the cats from the stock position. That's a violation of Federal law. But not all states, or jurisdictions enforce the law. If they test for NOx, you may fail without EGR. EGR and AIR really have no impact on performance.
You will need a catted Y-pipe, and harness extensions for the 4-wire heated O2 sensors
You will need a catted Y-pipe, and harness extensions for the 4-wire heated O2 sensors
09-29-2015, 01:09 PM
#9
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Re: Lt1 Header Opinions
A 97 has two cats, one on each bank. Still depends on what type emissions inspection you face. Long tubes relocate the cats from the stock position. That's a violation of Federal law. But not all states, or jurisdictions enforce the law. If they test for NOx, you may fail without EGR. EGR and AIR really have no impact on performance.
You will need a catted Y-pipe, and harness extensions for the 4-wire heated O2 sensors
You will need a catted Y-pipe, and harness extensions for the 4-wire heated O2 sensors
09-29-2015, 04:03 PM
#10
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Re: Lt1 Header Opinions
With long tubes, you can't fit both cats in the stock location. The driver's side cat is right at the bottom of the exhaust manifold, up against the engine block. Long tubes will move the cat at least 1.5-ft away from that location.
Find out what your local inspection requirements are. Not everyone enforces the Federal law. Some will just look and make sure there are two cats, since they don't really know where the stockers were even located.
From buddies in PA, I believe there is one set of inspection requirements for urban areas, and another set for rural areas. PAys to check.
When I first had my engine built, I was running modified AS&M mid-length headers, a custom 3" Y-pipe with dual CarSound cats, into a Mufflex 4" catback. CarSounds worked fine, considering it was making almost 500 HP at the flywheel. Technically a violation, because a 94 only had one cat, and Federal law prohibits changing the number of cats. That's when you need a friend at the inspection station.
Find out what your local inspection requirements are. Not everyone enforces the Federal law. Some will just look and make sure there are two cats, since they don't really know where the stockers were even located.
From buddies in PA, I believe there is one set of inspection requirements for urban areas, and another set for rural areas. PAys to check.
When I first had my engine built, I was running modified AS&M mid-length headers, a custom 3" Y-pipe with dual CarSound cats, into a Mufflex 4" catback. CarSounds worked fine, considering it was making almost 500 HP at the flywheel. Technically a violation, because a 94 only had one cat, and Federal law prohibits changing the number of cats. That's when you need a friend at the inspection station.
10-01-2015, 07:32 AM
#11
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Re: Lt1 Header Opinions
With long tubes, you can't fit both cats in the stock location. The driver's side cat is right at the bottom of the exhaust manifold, up against the engine block. Long tubes will move the cat at least 1.5-ft away from that location.
Find out what your local inspection requirements are. Not everyone enforces the Federal law. Some will just look and make sure there are two cats, since they don't really know where the stockers were even located.
From buddies in PA, I believe there is one set of inspection requirements for urban areas, and another set for rural areas. PAys to check.
When I first had my engine built, I was running modified AS&M mid-length headers, a custom 3" Y-pipe with dual CarSound cats, into a Mufflex 4" catback. CarSounds worked fine, considering it was making almost 500 HP at the flywheel. Technically a violation, because a 94 only had one cat, and Federal law prohibits changing the number of cats. That's when you need a friend at the inspection station.
Find out what your local inspection requirements are. Not everyone enforces the Federal law. Some will just look and make sure there are two cats, since they don't really know where the stockers were even located.
From buddies in PA, I believe there is one set of inspection requirements for urban areas, and another set for rural areas. PAys to check.
When I first had my engine built, I was running modified AS&M mid-length headers, a custom 3" Y-pipe with dual CarSound cats, into a Mufflex 4" catback. CarSounds worked fine, considering it was making almost 500 HP at the flywheel. Technically a violation, because a 94 only had one cat, and Federal law prohibits changing the number of cats. That's when you need a friend at the inspection station.
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