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Lake Pipes---how to muffle....

Discussion in 'The Hokey Ass Message Board' started by Mai Ki-Ki, Apr 12, 2004.

  1. Ok...been sorting out the lowering of my rear suspension..De arched springs and blocks..Basically means no room for the exhaust back there. So looking at spliting the manifold on my straight six and running two operational lakes pipes under the sills. Due to pretty full on noise attracting cops (this is on my daily driver), I was wondering the best way to run concealed baffles/muffling devices within the side pipes..the ends will most likely be seperate so i can remove the baffles etc for shows..

    <img src=>

    Anyone had much success doing this.
    Simply cannot run straight side pipes here, as much as i'd love to.



  2. tommy
    Joined: Mar 3, 2001
    Posts: 14,757

    Member Emeritus

    I have no idea what the underside of your car looks like but, I have used glass packs with U turns to get back to the front fender to hook up with the lakers.
  3. 48_HEMI
    Joined: Oct 3, 2002
    Posts: 838


    why not try them straight first? I've found that over 100 inchs of pipe does a pretty good job silencing sound. unless you wind it out thru the gears then you end up with the best of both worlds! [​IMG]
  4. manyolcars
    Joined: Mar 30, 2001
    Posts: 8,494


    curves in the pipes tend to cut down on noise

  5. DrJ
    Joined: Mar 3, 2001
    Posts: 9,418


    I vaguely remember some compact cars in the 70s like the Chevy Nova, Olds Omega, probably Holden size cars, running a muffler across the rear behind the differential that had the inlet and outlet on the same end. you could run these lengthwise just past the front wheel wells and let them do that U turn previously mentioned internally. If you want to be noisy at shows then I guess an additional cut out would be necessary.
  6. you could run some donut swirl baffles.I should do a tech post on how to do it.I'll take the camera to the shop today....Shiny
  7. I ran 20-30 large star washers held loosely together by a threaded rod in the straight pipes...!

    This way you can change the volume of your exhaust by varying the amount of washers you use! [​IMG]

    Then I drilled a hole perpendicular to the ground at the end of the exhaust pipe and put a 1/4" bolt through the top to hold the washers in the pipe while I was driving.

    I also attatched a Stainless cable to the rod so I could pull the whole works out if I wanted to have it loud for shows! [​IMG]

  8. Deuce Rails
    Joined: Feb 1, 2002
    Posts: 2,016

    Deuce Rails

    I haven't tried them, but what about inserts from Car Chemistry, / ?
  9. Jester
    Joined: Nov 4, 2003
    Posts: 961

    from Blevins AR

    Sorry Kat I jest gotta say it fudge the po po run it like you brung it.
  10. praisethelowered
    Joined: Aug 14, 2003
    Posts: 1,103


    Just this weekend I welded some motorcycle exhaust baffles inside my pipes right after the headers, they were about $3 at JCWhitney and I was pretty doubtfull that they would do anything. But my pipes are only about 2 feet long and after running it open for a while, glasspacks sounded really weak to me.

    Anyway, after letting the exhaust paint dry overnight I fired it up for the drive to work this morning and it sounds great- it is still deep and kind of barky, just a bit quieter than open pipes. I'd say try just metal baffles first with the long lakes it will probably be right on.

  11. =mike=
    Joined: Mar 5, 2001
    Posts: 820


    you need some of these . . . I would think you could get them at any harley shop in your town , cant guess how much they would cost . They should do the trick . EDITED to note , it is the inserts that say " sold each " that I am talking about . It wasn't suposed to be the whole damn page , just one little shot of those pipe inserts . you get the idea [​IMG]

  12. Jojo
    Joined: Jan 1, 2004
    Posts: 152


    While mine are true Lakes pipes. Here's a photo of what we did. The photo shows the type of exhaust I have:


    The flange on the end is an open hole. We welded on a solid pipe with a cap on the end (in gray). The pipe has several holes drilled in it. The hole assemble is inserted and bolted into the botoom flange on the exhaust. Kind looks like this:

    <img src=>

    You can modify the loudness by wrapping fiberglass around the inner tube until you get it right. Currently I have no fiberglass around mine and it is muffled just fine (I'm running a sbc 305).

    Even if this isn't exactly what you were looking for maybe it will inspire an idea that will fit your need.
  13. Jojo
    Joined: Jan 1, 2004
    Posts: 152


    That first line is supposed to be:
    "aren't true lakes pipes"
    but I'm sure you figured that. Sorry.
  14. flying clutchman
    Joined: Sep 7, 2003
    Posts: 328

    flying clutchman

    you know how in rod n kustom they do flashbacks in the rear of the magazine? i have one issue they did a flashback on this guy (cant remember the name), with this badass model a with a SBC. he rolled up wire mesh and shoved it into his open pipes. i have never tried this, so i dont know if it works.

  15. Aha..perfect..a bunch of ideas here i could use!
    Thanks Guys...Like the threaded rod idea with the star washers...i could wrap fiberglass etc around that rod too..or the harley baffles....hmmm



  16. Jojo
    Joined: Jan 1, 2004
    Posts: 152


    I'd like to hear about the donut swirls baffles from 29EHV8 still.

    MMMMM donuts.
  17. Just keep in mind that if the cops don't get you for the noise they may decide to get you for LOCATION. Operational Lake pipes on the Holden would be illegal as they won't be far enough past the last opening window of the car. I think it has to be somewhere near 30cm (plus) past the last window. Would be worthwhile checking this out.
  18. praisethelowered
    Joined: Aug 14, 2003
    Posts: 1,103


    Those motorcylcle baffles are exactly what I put in this weekend. I used the stubby 4" long ones because that is all the straight section I had- and they do work.

    I think I remember checking out the donut baffles and they were like a million dollars each. . . or $70 which might as well be a million for a little piece of metal- I went with the bike baffles because they were $3 and I wasn't sure baffles would do anything anyway.
  19. shoebox72
    Joined: Jan 24, 2003
    Posts: 1,491


    If the car is too low to run the pipes over the rear why not run the pipes straight under the rear? I did this on my 51 Chevy and it works out well. I just have to remove the tailpipes if I (god forbid) have to pull the rear end. I put a pair of brockman steelpacks on it &amp; all the old timers say it has the perfect sound but I just think it should be louder, so 1 muffler may go bye-bye soon.

  20. onelow48
    Joined: Jun 29, 2003
    Posts: 262

    from Maryland

    Jojo thats a very cool idea! My headers have a lot of bends
    in them. I did this thinking it would help the sound and back presure. I will be trying your idea. Great tech.
  21. Hi Maiki,

    Here is the legal RWC requirements for exhaust modifications, from thier web site:


    Modified and alternative exhaust systems are permitted if they satisfy the following requirements:

    The exhaust outlet must extend at least 40 mm beyond the furthermost outboard or rearmost joint of the floor pan which is not continuously welded or permanently sealed which could permit direct access of exhaust gases to the passenger compartment, but must not protrude beyond the perimeter of the vehicle when viewed in plan.

    If to the side of the vehicle, the exhaust outlet must discharge downwards at an angle to the horizontal of not less than 15 degrees nor more than 45 degrees, and to the rear of any adjustable window or vent; if the vehicle is manufactured after June 1988, the discharge must be to the right-hand side of the vehicle.

    If to the rear of the vehicle, the exhaust outlet must discharge at not more than 10 degrees above or 45 degrees below the horizontal.

    No exhaust system whether it be functional or ornamental is to be mounted in such a manner as to create a hazardous situation particularly from hot surfaces or projections.
    All piping and muffler systems must be adequately supported.

    Exhaust extractors may be fitted to a motor vehicle manufactured before July 1976, provided they do not foul any part of the steering, suspension, braking or fuel systems.

    In all other cases evidence either in the form of an Approval Certificate or acceptable evidence from the extractor manufacturer to show that the vehicle continues to comply with all applicable emission regulations will be required.

    Evidence from the extractor manufacturer is acceptable if it includes information:

    identifying the extractors as appropriate ones for the vehicle;
    certifying that the extractors have all the features and fittings necessary to allow the vehicle's emission control system to be reconnected and work properly; and
    describing how the extractors should be fitted.

    The vehicle must continue to comply with the ground clearance requirements.

    There must be no escape path for exhaust gases other than the exhaust outlet, and the vehicle must continue to comply with the noise emission standards applicable to it.

  22. Hey Mikee,

    Why not run the lakes pipes as you planned, but then where the outlet is, on the back the pipe from there to the rear beyond the axle. so continue the exhast back under the car, under the axle and exit. best of both worlds as you have a legal exhaust and the looks of pips which can be uncapped for fun.

  23. Peddro..the damn things illegal as is, and the cops have done a full walk around with me standing there and just said "have a nice day"...hehe...Wanna push them!

    Legality doesnt stop me...but was also think stright back pipe to rear under axle..will fit....same deal with baffles etc..hmmm....that would be easy to fab up too!


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