I've noticed on many GM diesel trucks a device that I interpret to be some sort of exhaust extractor. It is a section of tubing, approximately 1 1/2 " larger in dia than the tail pipe, welded on to the end of the tail pipe with S-shaped pieces of round bar. It looks like there is a section of the larger tubing that is necked down like a venturi positioned just beyond the end of the tail pipe. I've seen them installed on private vehicles, business vehicles, and even public transportation vehicles. I'm just wondering what the heck it's called, what it's supposed to do, and why don't I see it employed on anything else besides GMs. Inquiring minds want to know!Thanks for your time,Joe in St Louis
I've noticed on many GM diesel trucks a device that I interpret to be some sort of exhaust extractor. It is a section of tubing, approximately 1 1/2 " larger in dia than the tail pipe, welded on to the end of the tail pipe with S-shaped pieces of round bar. It looks like there is a section of the larger tubing that is necked down like a venturi positioned just beyond the end of the tail pipe. I've seen them installed on private vehicles, business vehicles, and even public transportation vehicles. I'm just wondering what the heck it's called, what it's supposed to do, and why don't I see it employed on anything else besides GMs. Inquiring minds want to know!Thanks for your time,Joe in St Louis