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Old August 6th   #1
JayMack75
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Exhaust Switch?

OK, ya'll are going to be shocked but I found a place to do my exhaust exactly how I want it done. Here's the problem...I decided to do a little something extra to it. What I want to do is have the sidepipes straight piped. I want a coupler that automatically switches from the straight pipes to the baffled pipes. What is that coupler called?? I know about it because I saw ot on hot rod TV or something like that on Spike, I just can't remember what its called or where to find it. Also, anyone know where I can find an O2 sensor eliminator for a 8.1L Vortec?
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Old August 6th   #2
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Are you talking about a cutout that can be remotely switched? I've see the plates on some of the older car headers that can be removed so that they can run open.

As far as the o2 sensor eliminator, it may be easier just to fab it in the pipes where you can leave it intact. The o2 is usually before the cat, so you can still do anything you want past the sensor. I'd check out some of the Chevy forums. I'm sure they also make a resistor pack of some sort you can put in its place.
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Old August 6th   #3
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Well they make the eliminator but its like 2 weeks until SECO can get one for me. The switch is kinda like what you're talking about, but its ona an electric switch mounted in the vehicle...it runs 2 seperate pipes though, when closed it runs through the baffled pipe and when open it runs the open pipe.
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Old August 6th   #4
jinusow
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JCWhitney has this its called a cast-iron exhuast cutout. Dash controlable. $39.99 part#wh241628 I think this is what you're looking for I don't know if this part comes up online they have it in the catalog.
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Old August 6th   #5
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Thats kinda like what I was looking for, but I just found EXACTLY what I was lookign for thanks to you. http://www.quicktimeperformance.net/...oduct_list&c=4 is the link to it. Now what should I run off my headers...hmmm...
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Old August 7th   #6
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That's what I was thinking of too. I didn't even know they made such a thing.

As far as what to run off the headers, straight out to the outside with a program set for it in your ecu, the other going straight into the regular stock exhaust. A quiet giant that could be quickly awoken...
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Old August 7th   #7
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Well I'm thinking if I do that then there would be no need for me to get the 02 sensor eliminator. If the cut out was mounted before the 02 sensor then it wouldnt make a difference...right?
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Old August 7th   #8
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It would have it be after the sensor so the sensor can take a reading first. That would be very cool. Street legal either way.
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Old August 7th   #9
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You dont think headers would mess it up do you?
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Old August 7th   #10
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Headers wouldn't mess up anything unless they have a cat in the header and those get removed. There's really not much gain by going cat-less. And a lot of times the sounds isn't as smooth.
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Old August 8th   #11
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So what size should I get? I can get anything from 2 1/4 to 3"
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Old August 8th   #12
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I'm not sure. I don't know the airflow characteristics for your motor. Typically, unless you've added any power adders, you don't want to go much larger than stock.

And most of the power gains from aftermarket headers really just comes from the design rather than the size. Having smoother air flow out of the engine and a better intake can allow the engine to breathe better, freeing some more power.
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Old August 8th   #13
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I'm trying to figure out what I got under there now...lol. In the future I plan on adding aluminum heads, and a bigger cam as far as power stuff goes, but im just trying to make sure these cut outs I got will mount up to my stock exhaust, then I am running the stacks from the other port. My main concern is just getting the cut out to mount up to the stock exhaust.
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Old August 8th   #14
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It seems like you can buy various sizes, so it should be able to work no matter what. If you wanted to make it a bolt-in/out affair, you could have them not weld it in place, but instead make flanges. That way, you could unbolt the entire assembly and put your stock one back in if you wanted.

If I had to do it, I'd put it in right after the last o2 sensor and use flanges. Then I'd get a good cat-back exhaust from someone that makes one (like Kooks or Borla) and have that bolt right on too. I don't think the cat would be a restriction, but if it is, I'd replace it with a high flow one, again with flanges, so you could bolt in a test pipe or go back to stock if needed.
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Old August 8th   #15
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Thats the thing, I am leaving the stock exhaust in place just adding the cut out to it. Then when I turn the cut out on it will route into the straight pipes and will be loud and free flowing...but when I get lets say...next to a cop, or in my neighborhood late at night, I can cut it off and it will be back through stock...so it will be quiet.
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Old August 8th   #16
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You could do side pipes under the running board. That would be pretty free flowing and look good as well. Then flip a switch and you're back to the regular pipe at the back. Of course, it'd look a bit goofy having 2 sets of exhaust pipes. You could just remove the tip on the stock one so you can't notice it.
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Old August 10th   #17
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When you plan on getting your pipe work done Jay?
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Old August 10th   #18
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As soon as I figure out how much of and what sizes of everything I am going to need and get it ordered and here, then I will be taking it down to get it worked on. I'm just having trouble piecing it all together.
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Old August 10th   #19
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I know what you meen I want to do so much to the car but trying to get everything straight is such a hassle.
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Old August 10th   #20
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get a y-pipe for the tubes, around $35 from jegs each.

there are other cheaper ones than the QTP, Mccord power plate makes
a good one, and they are like $125.

I have one if ya want to see it, it's over at David's(the one that did the
Air Bags, BTW I helped) I took it off my car after I swapped the mufflers out.
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Last edited by mytmous; August 10th at 01:47 PM.
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