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Thread: How loud are twice pipes?

  1. #1
    Professional Zcar Nazi
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    Default How loud are twice pipes?

    Hey guys, i want to buy an exhaust system that has free flow but isnt too loud.....i hate rice muffler sounds....so will twice pipes sound anything like this? or should i be looking for somthing else? thanks.
    1978 Datsun 280Z Black Pearl Edition (Bye Bye )
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    Registered User panchovisa's Avatar
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    I have a six into two (2 1/4") pipes back to two reverse flow turbo mufflers. The muffs are on each side of fuel cell. It is not "buzzy" or "farty", it's a deeper throatier sound. It is legal noise wise, but it gets loud on full throttle.
    If you want it done right then do it yourself.

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    Sweet, i have one more question for anyone who has or knows about MSA's twice pipe system, it says "with header" but $150? that seems very cheap for a header and the rest of the system, does it actually come with a header? thanks.
    1978 Datsun 280Z Black Pearl Edition (Bye Bye )
    1978 Datsun 280z White on Black Trim, 350SBC Swap Underway.

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    Registered User panchovisa's Avatar
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    Not so fast. Note that I was able to run TWO muffs. Will you fit one or two? Do you have the room? Running two pipes to one muffler doesn't seem quite right.
    If you want it done right then do it yourself.

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    The twice pipes dont come with mufflers?
    1978 Datsun 280Z Black Pearl Edition (Bye Bye )
    1978 Datsun 280z White on Black Trim, 350SBC Swap Underway.

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    The twice pipes come with mufflers, but they are only small diameter glass packs. As the fiberglass burns out, it will continue to get louder and louder.
    I had a set on my first 240 with the stock exhaust manifold and loved it until the mufflers started to burn out, then it got way to loud. Neighbor up the street used to call the cops on me at least once a week, it was legal, but just barely. In the end, it was almost as loud as a friends race car with dual straight pipes.

    The "with header" doesn't include a header, only a different head pipe to be used with a header, instead of the stock manifold.
    "If it weren't for fools, the rest of us could not succeed." Mark Twain.

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    Works aholic Z-point's Avatar
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    I’ve got a 6 in 2 header and dual straight pipes (like a works car) with a sort of glass packs at the rar end.
    The pipes are each, 2 inches (50mm) and for street noise reduction I use one steel sponge a pipe. The kind of sponge which you use to clean the cooking pan. Once I did measured it and I came without reduction at 120db! After 4000rpm it is like a trombone! And that is loud very loud….i don’t think the glass pack do any good in fact they are to low and therefore I’m thinking to get rid of them.
    Last edited by Z-point; 05-24-2004 at 01:30 PM.


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    Works aholic Z-point's Avatar
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    i forgot the picture
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    Last edited by Z-point; 05-24-2004 at 10:47 PM.


    "Colourful fearsome cars were roaring in the woods again.
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    Resident Wino Zvoiture's Avatar
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    Couplea things....

    It really depends on your compression. Street cars with twice pipes are loud. Anything over 11:1 with twice pipes is nearly unbearable. You can not stand behind the car without ear injury.

    I have considered using one of the 2-in-2-out mufflers with twice pipes. A lot of extra work considering the gas tank position and whatnot. Not sure what the outcome would be.

    steve
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    Works aholic Z-point's Avatar
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    You are absolutely right!
    Without my ‘steel noise reduction aid kit’ it was not normal to drive. At the end of the day you had a very nice headache.

    We had to drive a night rally, can you imaging…… and my co pilot said to me “we have to do something with the noise”. And so I came to the idea with steel sponges, which reduces a lot of sound. A cheap way to match the problem and it gives enough counter pressure in high gears. Something I missed with open pipes.


    "Colourful fearsome cars were roaring in the woods again.
    The sight and sound of the mighty Datsun 240Z will long be savoured".

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    Hi Guys,
    I likes the idea of Twice pipes but living the wrong side of the water to buy them I decided to make my own system. I used a couple of RC40 exhaust systems that are noramlly fitted to a Mini. After some 6 hours of cutting, modifying, welding & swearing it was finished.
    The results are good, it is not noisy at all at motorway speeds but on acceleration it sounds great & most important the system should be good for no power drop up to 260 bhp ! The car´s performance has certainly improved on the first shakedown run along the motorway the car was pulling an indicated 218 kph before I thought about my driving licence. The car certainly pulls a lot harder from 4,000 revs to 6,000 revs. I need to take the car to the local rolling road to reset up the car & confirm the results. I´m busy for the next couple of weeks but asap will report back.
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    Registered User ecp48's Avatar
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    Hey guy,

    I have an original NOS set of twice pipes, that I plan on installing. 1.75" pipes, glasspacks are 24" long paired with chrome tips.

    I know the glasspacks will probably need at least resonators on each pipe in the tunnel area, but has anyone used a crossover. On a V-8, the crossover connection smooths the pulses and usually produces more power. If it would remove some of the reported harshness from the twice pipes, it would definitely be a positive.

    ecp48
    Last edited by ecp48; 05-26-2004 at 08:28 AM.

  13. #13
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    I put up my experience on the twice pipes on the 'Reviews' section of the site about a year ago. Check it out for more detail if you want.

    I will say this, I love my twice pipe setup! Yes, it's pretty loud under full throttle! Is it ricer buzzy? Absolutely NOT! Will you like it? Who knows. Depends on what you want.

    I always say that it is a personal thing. Exhaust can give your car that last bit of personality. It's up to you what you want it to be. I wanted late '60's supercar sound. Got it!

    Car nuts always want to know what I have under the hood and comment on how great the car sounds. The rumble at idle is amazing....and I definately felt a difference in power after it was installed.

    FWIW,
    Zedguy

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    Registered User Dreco's Avatar
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    Default just my 2 cents

    I'm running a header, through 2 and 1/2 pipe, ending with a high flow muffler, and it's sounds great. (I should be running 3" though) Of course having a 3.0L with a very large cam probably helps with the sound..

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