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 Post subject: True Dual Exhaust :)
PostPosted: Sat Dec 03, 2011 2:06 pm 
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Has anyone tried to put true dual exhaust on the 3800 SC bonnevilles? I am working on it this winter after i drop in my rebuilt supercharged 3800 in this spring with headers. I work at a exhaust shop and i was really thinking about doing it, and more than likely i will. I will post a video or a couple pictures if i get it accomplished :dontknow:


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 Post subject: Re: True Dual Exhaust :)
PostPosted: Sat Dec 03, 2011 2:11 pm 
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I dont think itd be worth it at all really. A good dual system should have an X pipe anyway, which equates to a single pipe with two outlets. Just like our cars already have. If you managed to keep the two banks seperate all the way back, youd lose torque and gain a pretty awful sound IMO. Prime example is all the GM trucks running around with duals straight off the cats with no crossover. They sound like someone clapping, absolutely awful sound regardless of what mufflers, if any, they run.

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 Post subject: Re: True Dual Exhaust :)
PostPosted: Sat Dec 03, 2011 2:20 pm 
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yourgrandma wrote:
I dont think itd be worth it at all really. A good dual system should have an X pipe anyway, which equates to a single pipe with two outlets. Just like our cars already have. If you managed to keep the two banks seperate all the way back, youd lose torque and gain a pretty awful sound IMO. Prime example is all the GM trucks running around with duals straight off the cats with no crossover. They sound like someone clapping, absolutely awful sound regardless of what mufflers, if any, they run.


Most of those trucks you hear like that still use factory exhaust manifolds, a lot of them also run no cats as well as small exhaust pipe. I have true duals on my cutlass without a crossover and it has no clapping sound at all, just nice deep rumble. It all depends on your complete setup, not just duals or not.

That said I do agree though that there wouldn't be any real gains and would likely not sound any better, but then again I have never seen it done. You work at an exhaust shop so I say go ahead and do it, if you don't like it then go back to single or stock.

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 Post subject: Re: True Dual Exhaust :)
PostPosted: Sat Dec 03, 2011 2:46 pm 
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Search this topic, it has been debated multiple times.

Is it possible? Yeah, probably. Is it worth it? Not at all. It would sound like junk, and you'd have twice as much exhaust tubing and twice the headache. Keep the stock configuration, it's worked for pretty much every other 3800 that has ever been modded, including those in the 12's and 11's with 500+ horsepower. Hell, you really don't need to upgrade the cat-back at this point. All you're gonna do is change the sound.

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 Post subject: Re: True Dual Exhaust :)
PostPosted: Sat Dec 03, 2011 2:53 pm 
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Some one with an old body still grand prix gtp did it.

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 Post subject: Re: True Dual Exhaust :)
PostPosted: Sat Dec 03, 2011 7:44 pm 
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Unnecessary work IMO.

But you can still try. I thin you will have problems with fitting 2 pipes under the tunnel while keeping it somewhat protected.

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 Post subject: Re: True Dual Exhaust :)
PostPosted: Sat Dec 03, 2011 7:45 pm 
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There's no point...

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 Post subject: Re: True Dual Exhaust :)
PostPosted: Sat Dec 03, 2011 7:49 pm 
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00Beast wrote:
There's no point...


:withstupid:

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 Post subject: Re: True Dual Exhaust :)
PostPosted: Sat Dec 03, 2011 10:07 pm 
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Give it a shot! Worse case, you remove it.

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 Post subject: Re: True Dual Exhaust :)
PostPosted: Sat Dec 03, 2011 10:10 pm 
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That's a metric *shoot* ton of work to do to just remove, Dave....

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 Post subject: Re: True Dual Exhaust :)
PostPosted: Sat Dec 03, 2011 10:41 pm 
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00Beast wrote:
That's a metric *shoot* ton of work to do to just remove, Dave....


How? Unbolt and drop out.

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 Post subject: Re: True Dual Exhaust :)
PostPosted: Sat Dec 03, 2011 10:50 pm 
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crash93ssei wrote:
00Beast wrote:
That's a metric *shoot* ton of work to do to just remove, Dave....


How? Unbolt and drop out.


Ditto and beside, if I had the skills and the means to do it to my own car, I would! Many people would think what we do to our cars are already meaningless or stupid but we do it anyway because we want to. This is what makes us car enthusiasts.

Go for it, my friend!

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 Post subject: Re: True Dual Exhaust :)
PostPosted: Sat Dec 03, 2011 10:54 pm 
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From how I understand, he wants absolutely true duals, customizing headers so that each bank had its own pipe out to the back.

Just thought of another thing: The car reads off of a single O2 sensor that needs to be fed by both banks. Can't really accommodate that with true duals...

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 Post subject: Re: True Dual Exhaust :)
PostPosted: Sat Dec 03, 2011 11:14 pm 
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00Beast wrote:
From how I understand, he wants absolutely true duals, customizing headers so that each bank had its own pipe out to the back.

Just thought of another thing: The car reads off of a single O2 sensor that needs to be fed by both banks. Can't really accommodate that with true duals...



People also do that all the time on tons of other vehicles (how many trucks do you see with true duals?) I did however forget that the headers join into one before the downpipe. Either way though if you can do it cheap and not have leaks I say do it, but I wouldn't drop $200 on it though.

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 Post subject: Re: True Dual Exhaust :)
PostPosted: Sat Dec 03, 2011 11:44 pm 
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Even if it is riddled with problems, he might as well try it if he knows his stuff. If he likes it could be fun.

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 Post subject: Re: True Dual Exhaust :)
PostPosted: Sun Dec 04, 2011 12:12 am 
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Sounds like an amazing waste of money and steel for no gain over traditional FWD headers. If your wallet is that fat and you don't care that it's no better than any other option, I guess that's your choice. It'd be a ton simpler though if you converted the car to RWD at the same time.

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 Post subject: Re: True Dual Exhaust :)
PostPosted: Sun Dec 04, 2011 2:46 am 
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PRD2BDF wrote:
crash93ssei wrote:
00Beast wrote:
That's a metric *shoot* ton of work to do to just remove, Dave....


How? Unbolt and drop out.


Ditto and beside, if I had the skills and the means to do it to my own car, I would! Many people would think what we do to our cars are already meaningless or stupid but we do it anyway because we want to. This is what makes us car enthusiasts.

Go for it, my friend!


:laughing3: I have to agree. I've gotten grief from numerous people, including my dad, for upgrading the Bonneville. Haters gonna hate :dontknow: . Do whatever you want as long as you are capable of accomplishing it. If I worked at a shop I would have probably done all kinds of silly things to just test stuff out and learn a thing or two. Half of the reason I decided to even upgrade my Bonneville was because I wanted to learn more about engines.


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 Post subject: Re: True Dual Exhaust :)
PostPosted: Sun Dec 04, 2011 4:55 am 
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The only way for it to make any power or serious sound changes, you'd need long tube headers as well.

Putting a custom exhaust on stock exhaust manifolds is like putting lipstick on a pig.

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 Post subject: Re: True Dual Exhaust :)
PostPosted: Sun Dec 04, 2011 8:34 am 
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There is a lot of OPINION being thrown around as fact regarding exhaust, my "GM" truck has true duals off the stock manifolds running to some long cherry bomb style mufflers. It sounds good, has no rasp or clap sound and it picked up a little on the butt dyno when my dad had it installed years ago. Just because something is your personal preference you shouldn't claim that it is fact.

To the OP nobody on here has ever done it and more then likely no one ever will. If you want to try it I say go for it, however as most everyone has told you, there probably isn't much to gain over other more conventional exhaust mods on these cars

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 Post subject: Re: True Dual Exhaust :)
PostPosted: Mon Dec 05, 2011 1:41 pm 
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Space is a limiting factor. The largest I could feasable run was a 2" dual, with custom oval sections etc, an X-pipe for the O2 sensor, etc... A single 3" pipe has a larger cross sectional area than a dual 2", which means more flow. The dual 2" doesn't really fit in the hollowed out space the h-body car have anyway. You would have to run oval pipes, or something smaller, which defeats the purpose as there is plenty of room for a single 3" pipe...Which is why I'm building a 3" system.

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Last edited by MattStrike on Mon Dec 05, 2011 1:47 pm, edited 1 time in total.

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