Help Build Exhaust
Senior Member
Joined: Nov 2014
Posts: 241
Likes: 0
From: Antelope Valley
here is what is going to happen.
you replace the stock catalytic converters with hfc's (high flow cats)
your tear your exhaust apart and lets say you put spacers in the rear sensor(which was a popular fix on other vehicles but problem still persists) your vehicle will still be out of tune because there is less of a filter or secondary gasses. there is less o2 in the system so the vehicle will still try to lean out the engine. NO MATTER WHAT MAKE OR MODEL THIS WILL HAPPEN. Its all part of the OBD-II system in every car.
the purpose of the OBD-II system is to adjust the vehicle on the fly without having to stop or restart the car. sometimes it makes changes 5 to 7 times a second dependent on the application, much like you should have read on the previous link that I provided. this helps the vehicle run at its most efficient state for elevation, humididty, speed, temperature etc.
you can get away with basic modifications to a vehicle like less restrictive muffler or what is known as a catback system, a more efficient intake, lightweight pulleys etc. because the onboard diagnostic system will trim or add fuel as needed. when you remove a part of the OBD-II or change it, the vehicle will try to correct itself, if it cant THEN IT THROWS A CEL.
hope that this information might help, I know a lot of my responses have been a little short. I do know what I'm talking about because I have lived it. I support modding in most ways, its up to you how you would want to mod. I wouldn't want to burn up $8000 if I didnt' have to, and this knowledge hopefully will help prevent that.
you replace the stock catalytic converters with hfc's (high flow cats)
your tear your exhaust apart and lets say you put spacers in the rear sensor(which was a popular fix on other vehicles but problem still persists) your vehicle will still be out of tune because there is less of a filter or secondary gasses. there is less o2 in the system so the vehicle will still try to lean out the engine. NO MATTER WHAT MAKE OR MODEL THIS WILL HAPPEN. Its all part of the OBD-II system in every car.
the purpose of the OBD-II system is to adjust the vehicle on the fly without having to stop or restart the car. sometimes it makes changes 5 to 7 times a second dependent on the application, much like you should have read on the previous link that I provided. this helps the vehicle run at its most efficient state for elevation, humididty, speed, temperature etc.
you can get away with basic modifications to a vehicle like less restrictive muffler or what is known as a catback system, a more efficient intake, lightweight pulleys etc. because the onboard diagnostic system will trim or add fuel as needed. when you remove a part of the OBD-II or change it, the vehicle will try to correct itself, if it cant THEN IT THROWS A CEL.
hope that this information might help, I know a lot of my responses have been a little short. I do know what I'm talking about because I have lived it. I support modding in most ways, its up to you how you would want to mod. I wouldn't want to burn up $8000 if I didnt' have to, and this knowledge hopefully will help prevent that.
Thread Starter
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Senior Member
Joined: Jun 2002
Posts: 4,293
Likes: 6
So go with the Maggy cat that has the bung in it for the aft O2 and orient it so that the bung is downstream of the direction of flow. When you go to the magnaflow site, I can't figure out how to search for universal cats unless you search by particular part number. i know they have a few different lengths...how do you pick which length is best to go with? For example, the popular one around here seems to be the 94136. It has an O2 bung and 13" long. The 94166 is pretty much the same converter with an O2 bung, but it's 16" long. What difference would that make if any at all?
Last edited by Galaxy; Oct 19, 2015 at 11:13 PM.
here is what is going to happen.
you replace the stock catalytic converters with hfc's (high flow cats)
your tear your exhaust apart and lets say you put spacers in the rear sensor(which was a popular fix on other vehicles but problem still persists) your vehicle will still be out of tune because there is less of a filter or secondary gasses. there is less o2 in the system so the vehicle will still try to lean out the engine. NO MATTER WHAT MAKE OR MODEL THIS WILL HAPPEN. Its all part of the OBD-II system in every car.
the purpose of the OBD-II system is to adjust the vehicle on the fly without having to stop or restart the car. sometimes it makes changes 5 to 7 times a second dependent on the application, much like you should have read on the previous link that I provided. this helps the vehicle run at its most efficient state for elevation, humididty, speed, temperature etc.
you can get away with basic modifications to a vehicle like less restrictive muffler or what is known as a catback system, a more efficient intake, lightweight pulleys etc. because the onboard diagnostic system will trim or add fuel as needed. when you remove a part of the OBD-II or change it, the vehicle will try to correct itself, if it cant THEN IT THROWS A CEL.
hope that this information might help, I know a lot of my responses have been a little short. I do know what I'm talking about because I have lived it. I support modding in most ways, its up to you how you would want to mod. I wouldn't want to burn up $8000 if I didnt' have to, and this knowledge hopefully will help prevent that.
you replace the stock catalytic converters with hfc's (high flow cats)
your tear your exhaust apart and lets say you put spacers in the rear sensor(which was a popular fix on other vehicles but problem still persists) your vehicle will still be out of tune because there is less of a filter or secondary gasses. there is less o2 in the system so the vehicle will still try to lean out the engine. NO MATTER WHAT MAKE OR MODEL THIS WILL HAPPEN. Its all part of the OBD-II system in every car.
the purpose of the OBD-II system is to adjust the vehicle on the fly without having to stop or restart the car. sometimes it makes changes 5 to 7 times a second dependent on the application, much like you should have read on the previous link that I provided. this helps the vehicle run at its most efficient state for elevation, humididty, speed, temperature etc.
you can get away with basic modifications to a vehicle like less restrictive muffler or what is known as a catback system, a more efficient intake, lightweight pulleys etc. because the onboard diagnostic system will trim or add fuel as needed. when you remove a part of the OBD-II or change it, the vehicle will try to correct itself, if it cant THEN IT THROWS A CEL.
hope that this information might help, I know a lot of my responses have been a little short. I do know what I'm talking about because I have lived it. I support modding in most ways, its up to you how you would want to mod. I wouldn't want to burn up $8000 if I didnt' have to, and this knowledge hopefully will help prevent that.
I'm not 100% on it, but I can understand the point. A tuned vehicle is a happier vehicle most often. This would be an excellent question for a custom tuner file specialist.