Why the U-bend in the exhaust?
Thread Starter
Staging Lane
Joined: Dec 2006
Posts: 96
Likes: 0
From: New York
Why the U-bend in the exhaust? Ok Got up under the car today to take a good look at the exhaust lay-out. Well headers are out of the question...the front looks like a piece of cake,, with the cross over pipe being no big deal either,,,but the back?? I can't see anyway of getting in there. The down pipe and everything eles no problem..Hey,, is it just my car or doesn't the front of the cat get welded or clamped to the down pipe?? Looks like mine just got pushed in.
Anyway does anyone know the reason for the U-bend and the crimp in it??
There's plenty of room to use a stright pipe and put the o2 sensor in. I was going to replace the U-bend but looking for why it's done like it is.
And one other thing... All the cat-back set-ups I see have the same pipe layout as the stock lay-out so why would I want to pay $700 plus for a set of high flow mufflers?? Why not just change out the mufflers?
Anyway does anyone know the reason for the U-bend and the crimp in it??
There's plenty of room to use a stright pipe and put the o2 sensor in. I was going to replace the U-bend but looking for why it's done like it is.
And one other thing... All the cat-back set-ups I see have the same pipe layout as the stock lay-out so why would I want to pay $700 plus for a set of high flow mufflers?? Why not just change out the mufflers?
Launching!
Joined: Jun 2006
Posts: 254
Likes: 0
Most of the cat-backs I have seen are larger tubes. If I remember correctly, stock we have 2.25" and most aftermarket are going to be 2.5" or 3" pipes.
Reason behind the other stuff? Not sure. Availability of the parts and keeping stuff the same? Emissions? Noise control? GM does some strange things sometimes.
I have not really been under the car yet. Why are headers out of the question?
Reason behind the other stuff? Not sure. Availability of the parts and keeping stuff the same? Emissions? Noise control? GM does some strange things sometimes.
I have not really been under the car yet. Why are headers out of the question?
TECH Fanatic
Joined: Oct 2006
Posts: 1,190
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Originally Posted by NewYork Art
The down pipe and everything eles no problem..Hey,, is it just my car or doesn't the front of the cat get welded or clamped to the down pipe??
Originally Posted by NewYork Art
Anyway does anyone know the reason for the U-bend and the crimp in it?? There's plenty of room to use a stright pipe and put the o2 sensor in. I was going to replace the U-bend but looking for why it's done like it is.
Originally Posted by NewYork Art
And one other thing... All the cat-back set-ups I see have the same pipe layout as the stock lay-out so why would I want to pay $700 plus for a set of high flow mufflers?? Why not just change out the mufflers?
There are a couple of huge threads discussing all of these topics in this forum, worth reading.
Don't know about everyone else (though they should be the same), but the Impala SS is 2.5" to the Y and then 2" to the mufflers. Buff measured it after getting his Magnaflow installed. The Magnaflow is 2.5", mandrel bent, all the way. 
Thread Starter
Staging Lane
Joined: Dec 2006
Posts: 96
Likes: 0
From: New York
Well,
After some looking at Hogan down pipe set-up. I like what they have with the High flow cat /d/pipe setup it has the stright pipe for the o2 sensor too. I may go with that and the Magna flow Cat back. Looking for a price now for the magna flow cat back for my car....Hogan set-up is $290 plus $13 for a gasket,,like to gives Kooks a call just for fun to see their price for the pipes and magna flow set-up
After some looking at Hogan down pipe set-up. I like what they have with the High flow cat /d/pipe setup it has the stright pipe for the o2 sensor too. I may go with that and the Magna flow Cat back. Looking for a price now for the magna flow cat back for my car....Hogan set-up is $290 plus $13 for a gasket,,like to gives Kooks a call just for fun to see their price for the pipes and magna flow set-up
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The u-bend is to protect the O2 sensor, so it is not vulnerable to damage causing chunks of hazardous debris lol....
GM made it this way to cover their ***...but the sensor can fit with straight pipe.
GM made it this way to cover their ***...but the sensor can fit with straight pipe.
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