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Straight through exhaust??

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razzle308
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2012/01/28 16:04:20 (permalink)
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Straight through exhaust??

Hi All.
Just wondering. I would like to run a straght through exhaust.
(2.0+, big bore extractors. 2 1/2 system.)
Given it is a street car i have to worry about noise.
My question is - will 2 straight through mufflers lowwer the noise enogh to get me by.
Obviously when i tramp it it will shout a bit.
But generally could i get it quiet enough (sort of) with the two resinators or hot dogs or whatever.
I don't want it quiet - just not Harley loud.
 
Thanks.
Darren.
#1


18 Replies Related Threads

    Avon
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    Re:Straight through exhaust?? 2012/01/28 19:40:47 (permalink)
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    Pretty much certain it will be too loud.  I run a normal muffler under the car with a rear hotdog resonator.  Its loud.  In fact its coming off and I'm going back to something quieter.
     
    I'm getting around 95db in the cabin!
    #2
    Flighter
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    Re:Straight through exhaust?? 2012/01/28 20:41:05 (permalink)
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    Avon

    Pretty much certain it will be too loud.  I run a normal muffler under the car with a rear hotdog resonator.  Its loud.  In fact its coming off and I'm going back to something quieter.

    I'm getting around 95db in the cabin!

     
    A while back I spoke to a muffler guy and asked what he could do to make my 2.0 quieter.  He said the best he could do was the single muffler and resonator combo, which is what I already have.  This struck me as odd given that the car came with a large and small muffler when new.  I'd be very interested to hear if you successfully tame your exhaust volume and exactly how.
     
     
    #3

    razzle308
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    Re:Straight through exhaust?? 2012/01/28 21:07:17 (permalink)
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    Hi Avon. Been a bit busy with the new house :-( (although its great to have a house finally)
    Ordered my extractors this week :-) - but i still have to get the sump back off :-(
     
    Hmm.
    Be interested to hear more.
    It's true i don't want to be too loud - but then ive heard a lot of noise v8's.
    I just really want the straight through. I thought maybe someone here has done something similar.
    I had a center in offset out high flow on it's own before but it really wasn't that loud. So i just wondered if i did the two straights if it would drop enough when not under heavy load.
     
     
    #4
    ratta tat tat
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    Re:Straight through exhaust?? 2012/01/28 21:43:06 (permalink)
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    Straight through will be loud you can't change that. Have you thought about a Tri flow muffler?
    #5
    gazz
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    Re:Straight through exhaust?? 2012/01/29 07:42:37 (permalink)
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    i had a 2 1/2 inch with 1 large straight through muffler going out the side and it was ear bleeding when cruising and under load, sounded great at idle though. ended up going back to full 2 1/4 with 1 good quality offset muffler at the rear just before the diff. it is still a louder than your average car especially when you put your boot into it, but doesnt give me a headache in 2 minutes.
    #6

    razzle308
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    Re:Straight through exhaust?? 2012/01/29 11:03:48 (permalink)
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    how did you get away with a side pipe!!??
    #7
    gazz
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    Re:Straight through exhaust?? 2012/01/29 12:32:03 (permalink)
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    i have a mk1 2 door with windows at the back that dont open so its legal in south australia provided:
     
    Exhaust Outlets

    For vehicles manufactured prior to July 1988 the requirements are not specific, however, vehicles submitted to Transport SA will be acceptable if:-

    a. The exhaust outlet exits beyond the last door or window opening on the side or rear of the vehicle;
    b. The exhaust outlet is as close as possible to the outer edge of the vehicle but not outside or underneath
    the vehicle;
    c. The exhaust system, if contactable, is adequately shielded and any sharp or hazardous projections are
    suitably treated.
     
    if i got pulled up i reckon the noise would have been way over the limit anyway. good thing i didnt get pulled up.
    #8
    MK1_Oz
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    Re:Straight through exhaust?? 2012/01/29 15:44:44 (permalink)
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    Hi Gazz.  Where did you route the exhaust under the car?  Did you modify the chassis rails or just go under them?  Did you exit into a 2 1/2" pipe or use a rectangular section exit pipe?  I am thinking about a side exhaust for my Mk1 2dr rally car but I am not sure that there is sufficient clearance to make it worthwhile.  The car will only be 1-2" lower although will have stiffer springs.
     
    Got any pics?
    #9
    Matt75
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    Re:Straight through exhaust?? 2012/01/29 17:34:41 (permalink)
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    The pretty standard way is the muffler than the hot dog.  You could just try the 1 muffler and then see how you go.
     
    It's pretty easy to add the on later if need to
     
    Cheers
     
    Matt
     
     

     
    My 4 door MK II Resto
    http://www.classic-ford.org/cfp/tm.aspx?m=37623

    RS Owners Club Victoria Committee Member - http://rsocvic.com/
     
     
    #10
    Lachie_82
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    Re:Straight through exhaust?? 2012/01/29 18:22:40 (permalink)
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    Hi
    I am running a 2 and a quarter inch exhaust and straight thru center muffler and a hot dog at the back. It is loud and I have ringing ears after about 1 hour od driving.

    Cheers

    Lachie

    1979 Mk 2 RS2000

    RS owners club of Victoria member
    #11
    gazz
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    Re:Straight through exhaust?? 2012/01/29 21:07:27 (permalink)
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    oz,
     i just went from the extractors to muffler/resonator and used a 45degree elbow straight out under the chassis rail on the drivers side, i have a few photos from when i did it the first time with just a resonator, it was then upgraded to a proper muffler, no room for both, but it was a lot better with the muffler. i just welded a mount on the chassis rail and used some rubber donuts to hold it up. think i put a mount on near the muffler when i changed to that too, cant remember now. it was 2 1/2 inch pipe to the end.
    my car had 1.5 inch lowering blocks in the back at that stage, and i used to scrap it a bit on sharp driveways etc.. the chassis rail was definately the lowest point, much better clearance with a full system.

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    #12
    RSman4ever
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    another bonus is...... 2012/01/30 11:35:38 (permalink)
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    I had a side exit set up like this years ago and the best thing is that when do a burnout the exhaust blows the smoke out further away from the car
     
    #13
    Matt75
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    Re:another bonus is...... 2012/01/30 15:32:27 (permalink)
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    RSman4ever

    I had a side exit set up like this years ago and the best thing is that when do a burnout the exhaust blows the smoke out further away from the car



    You are an ideas man!

     
    My 4 door MK II Resto
    http://www.classic-ford.org/cfp/tm.aspx?m=37623

    RS Owners Club Victoria Committee Member - http://rsocvic.com/
     
     
    #14
    Flighter
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    Re:Straight through exhaust?? 2012/01/30 19:38:44 (permalink)
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    Matt75

    The pretty standard way is the muffler than the hot dog.  You could just try the 1 muffler and then see how you go.


     
    Contrary to what I expected, the muffler man told me the resonator reduces noise rather than adds to it.
    #15
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