picture definition of the W-body U-bend
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i had always pictured it way different than this, but i just found this picture and wanted to share in case anyone else wanted to know
bonnevilles DO NOT have this
![](https://www.pfyc.com/store/graphics/new/wb5001.jpg)
bonnevilles DO NOT have this
![](https://www.pfyc.com/store/graphics/new/wb5001.jpg)
On the factory exhaust for your car, GM decided they wanted the O2 Sensor mounted vertically which resulted in what'* been termed the U-Bend. This restrictive section of pipe causes added backpressure resulting in power loss. Modifying your car with a different intake system and/or smaller pulley only makes this restriction worse. Free up this restriction with our U-Bend replacement.
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What the hell was GM thinking? ![Roll Eyes](https://www.gmforum.com/gm/images/smilies/rolleyes.gif)
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Originally Posted by fantastic88
Why did they put that there? It doesn't even make sense.
GM decided they wanted the O2 Sensor mounted vertically which resulted in what'* been termed the U-Bend
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Originally Posted by jr's3800
What the H*** was GM thinking? ![Roll Eyes](https://www.gmforum.com/gm/images/smilies/rolleyes.gif)
![Roll Eyes](https://www.gmforum.com/gm/images/smilies/rolleyes.gif)
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Originally Posted by toastedoats
Originally Posted by jr's3800
What the H*** was GM thinking? ![Roll Eyes](https://www.gmforum.com/gm/images/smilies/rolleyes.gif)
![Roll Eyes](https://www.gmforum.com/gm/images/smilies/rolleyes.gif)
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Originally Posted by BillBoost37
Originally Posted by toastedoats
Originally Posted by jr's3800
What the H*** was GM thinking? ![Roll Eyes](https://www.gmforum.com/gm/images/smilies/rolleyes.gif)
![Roll Eyes](https://www.gmforum.com/gm/images/smilies/rolleyes.gif)
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It was a wise decision by GM, my GTP scrubs the undercarriage going over those long speed bumps. The U bend does restrict exhaust flow, but it does make the stock exhaust sound cool right at the U bend. I would replace mine, but I'm not modifying it unless parts fail, like my fuel pump, I now have a Walbro. It'* just the beater car, I put all my love in the Bonnie.
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