header emission test
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From: RI
header emission test is it possible to pass the sniffer test with pacesetter LT on a stock lt1? 95 z28
will it pass without cats, egr, air?? or should i leave cats on somehow?
im just lookin for an idea, if its gonna be close or is it gonna blow it away?
let me know what you think
thanks
will it pass without cats, egr, air?? or should i leave cats on somehow?
im just lookin for an idea, if its gonna be close or is it gonna blow it away?
let me know what you think
thanks
You want to be careful with how close you locate any opening (cutout) to the header. It will allow air to reach o2 sensors and throw off readings of you get too close. I would try to get a smaller tube style high flow cat to place right where the stock cat location was.
You just need the air portion of your system to "look" ok on your car for the testing. It will not throw a code if you disable it. Pulling the fuse will do this from what I understand on 95 and below. After you pass you can put plugs in and block off air portion on your headers.
You just need the air portion of your system to "look" ok on your car for the testing. It will not throw a code if you disable it. Pulling the fuse will do this from what I understand on 95 and below. After you pass you can put plugs in and block off air portion on your headers.
You want the Long tubes to come down, with your Y or X pipe connected with flanges so it can be bolted on or off, do not weld it to the headers. Then you want the cutouts to be before the cats (otherwise you are defeating the purpose of a cutout), and in the "straight" part of the Y/X pipe. You need 2 cats and 2 cutouts, don't try to pull it off once the Y pipe comes together.
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Here is pics of my dual catted y-pipe. I bought Pacestters ORY and added the fullsize 3" Magnaflow converters. I did a track test with an ORY and I ran the same ET and MPH as with cats so don't worry about cutouts. You could fit them but you loose a lot of ground clearance. Depending on the emission limits in your state you may have trouble on Nox due to the EGR not functioning properly with the reduced back pressure in the exhaust.
Thread Starter
TECH Enthusiast
Joined: Mar 2009
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From: RI
Here is pics of my dual catted y-pipe. I bought Pacestters ORY and added the fullsize 3" Magnaflow converters. I did a track test with an ORY and I ran the same ET and MPH as with cats so don't worry about cutouts. You could fit them but you loose a lot of ground clearance. Depending on the emission limits in your state you may have trouble on Nox due to the EGR not functioning properly with the reduced back pressure in the exhaust.
Thread Starter
TECH Enthusiast
Joined: Mar 2009
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From: RI
is this cat going to work with the y pipe if i put 2 of them? do i need to spot for the air on the cat?
http://www.summitracing.com/parts/MPE-53009/
http://www.summitracing.com/parts/MPE-53009/
They make a shorter version of the cat that would fit better. The guts are the same but the overall length is about 3 inches shorter. I don't have the part number for it though. You can use clamps if you like but I hate leaks so welding is better. As said above you don't need air pipes on the cats.