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  •  » New exhaust

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    4/17/2013 8:26 PM  #1

    Alan
    I FYI 24-7

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    From: Axtell KS
    Registered: 4/03/2013
    Posts: 513

    New exhaust

    I am just about ready to get exhaust put on my 67. It has a 302, 4v with a mild cam. What size pipe would you recommend? 2" , 2-1/4, or 2-1/2". Most likely will just be street driven. What advantages or disadvantages are the different sizes? Has long tube headers on it.

     

    Last edited by Alan (4/17/2013 8:47 PM)

    67 Coupe, 5.0 EEC IV Fuel injected. T5, 3:70 rear
     

    4/18/2013 10:01 AM  #2

    Rudi
    Senior 24-7 FYI Addict

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    From: Stuck in the 50's Welland Ca
    Registered: 4/01/2013
    Posts: 3,933

    Re: New exhaust

    If it's a coupe/fastback 2 1/2"  On a convertable  2 1/4"  may be a better choice because of the  cross over plate.  I have seen the larger diameters on the convertable but it takes more work to get it right.

    Good work ain't cheap, Cheap work ain't good!   Simple Man
     

    4/18/2013 10:32 AM  #3

    MS
    Forum Originator

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    From: Canyon Lake, Texas
    Registered: 1/24/2013
    Posts: 12,155

    Re: New exhaust

    2-1/4" seems to make the most sense on a small block.  It is alot easier to fit, is a little quieter than 2-1/2" and is less money.  It will still flow more than your engine can pump.

    Money you enjoy wasting is NOT wasted money... unless your wife finds out.
     

    4/18/2013 4:20 PM  #4

    Alan
    I FYI 24-7

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    From: Axtell KS
    Registered: 4/03/2013
    Posts: 513

    Re: New exhaust

    I am leaning toward 2-1/4. Is 2" too restrictive?
     

    67 Coupe, 5.0 EEC IV Fuel injected. T5, 3:70 rear
       •Thread Starter
     

    4/18/2013 9:54 PM  #5

    6sally6
    Hyper FYIFORD ADDICT

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    From: Surfside Beach,SC
    Registered: 4/02/2013
    Posts: 6,732

    Re: New exhaust

    Probably not....if you use a free flow mufler.
    That's where most "restriction" stems from, not so much the pipe dia.
    6sally6

    Get busy Liv'in or get busy Die'n....Host of the 2020 Bash at the Beach/The only Bash that got cancelled  )8
     

    4/19/2013 1:05 PM  #6

    lowercasesteve
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    From: Auburn, Ca
    Registered: 4/01/2013
    Posts: 1,248

    Re: New exhaust

    I'm with the rest.  On a mild 302 a 2 1/4" pipe is plenty.  You will not get to the rpm level where more volume is needed.  And you cannot believe how much more room underneath you will have for other stuff using a 2 1/4 vs 2 1/2 pipes.  I use only a 2/12 on my 351w.

    Even the 2" would probably work just fine for normal driving, but you might find yourself  little lacking at the top end with sprightly driving.

    Last edited by lowercasesteve (4/19/2013 3:31 PM)

    Original owner - 351w,T-5, 4whl disks, power R&P
     

     

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