I have the most strange exhaust? Dutch Tahoe

[Tonny]

I've tried google and called with some American exhaust dealers here in the Netherlands.

Because I want to change my muffler I measured my exhaust and it seems very weird. From the cats it goes to single 2,75 inch into muffler and dual out 3,0 inch to single 3,0 inch coming out of the back.

I'm just wondering whats going on? It looks all original. And obviously it's all fixable with some customization. But wth?

I hope you guys can tell me more!

Greets from the Netherlands,

Tonny

 

[wjburken]

I am not able to speak to your particular issue but I would like to welcome to the forum from Iowa.

There are a lot of folks on here that can help.

 

[01FormulaTA]

post some pictures so we can see what you are talking about

 

[drakon543]

please give us the specific year and specific model too please. i did find one muffler from walker thats supposed to be oem. it specifically has a notation that it replaces the stock dual outlet muffler. but specific year and model may point to an odd 1 yr design change or something.

 

[Doubeleive]

sounds like someone may have previously replaced the muffler that had a dual out and the "y" piped it back into a single out, in which case you can just replace it with whatever is suitable for you and delete the y pipe if necessary, like Chris said some pictures would be helpful.

 

[Tonny]

Hi guys, many thanks for the replies so far. I understand that pictures will make it more clear. I will try to get my Tahoe on a lift this weekend so I can make some proper pictures. Will get back to you guys!

It's a 2001 LT 4wd.

 

[Big Mama]

Also, are there any exhaust restrictions where you live? No duals, a certain tone, are cats required, do you get inspected, etc?

 

[Tonny]

Also, are there any exhaust restrictions where you live? No duals, a certain tone, are cats required, do you get inspected, etc?

Yes the Netherlands is the most ****** up country to live in as a car enthousiast. For example, a Tahoe in 2001 cost around €70.000 or $66.000 compared to that years course. That has all to do with emissions. Around €17.000 of the €70.000 was payed only for emissions. And the rules about cats and emissions depend on the year of the car but I'm sure I need to keep those. And yes the emissions output will be tested every year with the MOT. Also decibels. But the thing is, this Chevy Tahoe is more quiet then most of the cars because when I arrived with my Peugeot 1.1 gasoline all stock at my moms, she would hear that, and the dog too. But she rarely hears me arriving with the Chevy, same counts for the dog who hears everything. Also Diesel cars make more noise then the Chevy. But anyway, I can keep writing for days but I got some pictures!!

Btw, this Chevy is original Dutch delivered, most American cars are imported. So the guy who bought it at the time, had to be fairly rich.

So here the cats come from the front, yes I have a leaking oil-filter. Will be replaced soon.

Cats here connecting to the single 70mm/2.75 inch tubing that goes to the muffler:

So 2.75 inch into muffler:

Then dual 3 inch out of muffler, and you can see them forging into single 3 inch:

Ok have to make new post for rest of pictures

 

[Tonny]

Wich then comes out of the back of the Hoe: and yes my diff will get a new gasket too

And we Dutch people call this a large muffler. A truck has smaller ones here in the Netherlands

 

[Tonyrodz]

My 03 Tahoe had the same setup. I never understood it either.

 

[01FormulaTA]

exhaust appears to be a factory setup but what looks strange to me is the way the tail pipe exits the rear....all the NBS Tahoes I have seen have the exhaust exit below the rear quarter panel on the passenger side (see pic below) vs your setup is exiting straight out under the bumper....makes me wonder if it was pieced together from some other GM factory exhaust setups?

 

[drakon543]

this is all i could find relating to your exhaust. as its noted that it replaces the dual outlet muffler. as its specifically noted im assuming certain places had that style exhaust on the tahoes when they were shipped there. kind of like how here in the states you have some vehicles with extra cats on them if they had the California exhaust. i can't see the purpose but its possible. vehicle has to have some stupid tweek so it meets some guideline to be sold there from the factory but doesn't apply to the end consumer. also probably hence why you cant buy that particular exhaust.

 

[Doubeleive]

I don't see any reason you couldn't just put whatever you like on there as a replacement if you go with a smaller muffler then it most likely will have a louder exhaust sound, I put a borla on mine but it is much louder than a stock muffler
View media item 27794

 

[Tonny]

exhaust appears to be a factory setup but what looks strange to me is the way the tail pipe exits the rear....all the NBS Tahoes I have seen have the exhaust exit below the rear quarter panel on the passenger side (see pic below) vs your setup is exiting straight out under the bumper....makes me wonder if it was pieced together from some other GM factory exhaust setups?

Yes I noticed that too. I've a theory for that, that might actually be a fact. The Netherlands is the land of people cycling. And next to many roads there a cycling lanes (I've been to America and you guys do not seem to have that). It would mean all the exhaust fumes would blow to the cyclists. When you look at German cars, when they only have a single muffler it will always exit on the left side back of the car. If you look at Japanese cars, it's very common that the exhaust exits on the right side back (they drive on the wrong side of the road, just like the English people). But in America they just don't give a **** .

 

[Tonny]

View attachment 238822
this is all i could find relating to your exhaust. as its noted that it replaces the dual outlet muffler. as its specifically noted im assuming certain places had that style exhaust on the tahoes when they were shipped there. kind of like how here in the states you have some vehicles with extra cats on them if they had the California exhaust. i can't see the purpose but its possible. vehicle has to have some stupid tweek so it meets some guideline to be sold there from the factory but doesn't apply to the end consumer. also probably hence why you cant buy that particular exhaust.

Yes I understand what you tell. Every country has other rules at the end. I'm not afraid that I can't fix my exhaust, but the measurements just seemed weird to me, but that is just how they did it at GM, maybe they had some parts laying around
I'm thinking about straight piping it after the cats, so no muffler. But I've to stay under 95 + 2 decibels for the MOT. But from what I've seen on Youtube, it does not sound extreem loud without a muffler, but it's always hard to say from a video.

I don't see any reason you couldn't just put whatever you like on there as a replacement if you go with a smaller muffler then it most likely will have a louder exhaust sound, I put a borla on mine but it is much louder than a stock muffler
View media item 27794

Yes you're right mate. As long as I keep the decibels under a certain level at a certain RPM, that will be tested with the MOT. As well as different things in the exhaust fumes but the muffler should not really help with that?

My truck runs on LPG btw, that is very common to do with the American cars here in The Netherlands, you've to be rich to drive a American on patrol here And it's actually a very clean combustion. Most of the fumes you see is water or condensation of that

 

[ivin74]

Wich then comes out of the back of the Hoe: and yes my diff will get a new gasket too
View attachment 238745

View attachment 238744

View attachment 238747

View attachment 238749

View attachment 238748

And we Dutch people call this a large muffler. A truck has smaller ones here in the Netherlands

My YD had the same set up as yours, I modified it to be a true dual exhaust.


That's a ****** design on part of GM

 

[drakon543]

i ran a magnaflow 3in cat back to a 3in flowmaster 40 3in out and it sounded nasty. but that was on a 94 non vortec 350. straight piping is generally pretty loud if your concerned about db i wouldn't straight pipe it. even if it does stay under the db levels your area requires it increases the likelihood you would get pulled over regularly. some headers and a nice full exhaust setup will get you a nice sound but keep the levels controlled.

 

[Doubeleive]

Yes I understand what you tell. Every country has other rules at the end. I'm not afraid that I can't fix my exhaust, but the measurements just seemed weird to me, but that is just how they did it at GM, maybe they had some parts laying around
I'm thinking about straight piping it after the cats, so no muffler. But I've to stay under 95 + 2 decibels for the MOT. But from what I've seen on Youtube, it does not sound extreem loud without a muffler, but it's always hard to say from a video.




Yes you're right mate. As long as I keep the decibels under a certain level at a certain RPM, that will be tested with the MOT. As well as different things in the exhaust fumes but the muffler should not really help with that?

My truck runs on LPG btw, that is very common to do with the American cars here in The Netherlands, you've to be rich to drive a American on patrol here And it's actually a very clean combustion. Most of the fumes you see is water or condensation of that

how much is the petrol there? and how much is the propane?

 

[Tonny]

how much is the petrol there? and how much is the propane?

From my post in June:
''Well compared to gasoline I pay around €0,64 per liter gas or €1,60ish for gasoline per liter; €2,90 per gallon LPG or €7,26 per gallon gasoline. LPG is actually a cleaner fuel. But can sense some lag of power when driving on LPG.''

 

[BigJake]

My wife's 2005 5.3 had the same thing. I went with a 3" single inlet dual 2.5" outlet magnaflow, and it sounds AWESOME !