dual exhaust

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    Author Topic: dual exhaust  (Read 5049 times)

    Offline Jimmy C

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    dual exhaust
    « on: August 11, 2015 - 10:30:28 PM »
    Hey fellas, any reccomendations for a cheap (economical) dual exhaust for my 318 Chally? I have a stock setup at the moment. I don't fell like spending a lot of money until i do a complete frame off in the later future. Looking for 2.5 inch pipes.
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    70 Challenger
    Menifee, California
    Former San Diego resident


    Offline djw383

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    Re: dual exhaust
    « Reply #1 on: August 11, 2015 - 11:17:42 PM »
    Local pipe shop to bend you up something

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    Offline Chryco Psycho

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    • 70 Challenger R/T SE 70 tube Chassis Cuda now sold
    Re: dual exhaust
    « Reply #2 on: August 11, 2015 - 11:46:27 PM »
    I would use 2.25" on a 318
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    Challenger - You`ll wish You Hadn`t

    Offline Topcat

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    Re: dual exhaust
    « Reply #3 on: August 12, 2015 - 12:19:29 AM »
    H pipe it while you're at it.
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    Mike, Fremont, CA.

    Offline burdar

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    Re: dual exhaust
    « Reply #4 on: August 12, 2015 - 10:11:11 AM »
    The least expensive mandrel bent system will probably be something from Summit Racing.  Accurate exhaust makes nice dual exhaust systems for the 318 but they aren't cheap.  The up side is that you can get all the factory style hangers to mount the system from Accurate.  A local muffler shop can bend you a system cheaper but exhaust work is becoming a lost art.  It's a lot harder to find someone that knows what they are doing.  The other down side is that the pipes won't be mandrel bent.  That's probably not a huge concern with a 318 car but it's worth mentioning.
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    Offline azievinger

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    Re: dual exhaust
    « Reply #5 on: August 12, 2015 - 10:55:27 AM »
    Chryco Psycho,

    May I ask Why 2.25 and not 2.5 ?

    Alvin
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    Offline tman

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    Re: dual exhaust
    « Reply #6 on: August 12, 2015 - 12:26:49 PM »
    There are lots of articles on exhaust sizing and you are asking for a loooooong answer.  I would say, 2.25 is more than enough unless you have a 318 built for 400hp.  Unless you plan on the future of dropping a bigger motor.  Here is one simple article, but you can look up much more to satisfy your quest for an answer. 

    http://www.exhaustvideos.com/faq/how-to-calculate-muffler-size-pipe-diameter/
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    Offline 67vertman

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    Re: dual exhaust
    « Reply #7 on: August 12, 2015 - 01:40:34 PM »
    Quote from: azievinger on August 12, 2015 - 10:55:27 AM
    Chryco Psycho,

    May I ask Why 2.25 and not 2.5 ?

    Alvin

    Some “testing” has shown that having a larger exhaust system actual reduces horse power by scavenging back pressure from the exhaust valves. 
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    Ron - Born and raised in Southern California

    I got the 1970 Cuda, but still need the hot blonde to ride shotgun!

    First car -1969 Road Runner 383 4sp

    Current ride - 1970 Barracuda 440-6 4 sp Dana 60  (4:10)

    Offline Chryco Psycho

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    Re: dual exhaust
    « Reply #8 on: August 12, 2015 - 11:59:53 PM »
    nothing to add here , smaller pipe = increased velocity , 2.25 is a better match for the smaller 318
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    Challenger - You`ll wish You Hadn`t

    Offline Jimmy C

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    Re: dual exhaust
    « Reply #9 on: August 13, 2015 - 12:26:37 AM »
    Thanks for the input fellas, ill ask around some of the muffler shops in San Diego to see about cost. I was eye balling the ones on Jegs or Summit.
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    70 Challenger
    Menifee, California
    Former San Diego resident

    Offline azievinger

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    • one Happy Island
    Re: dual exhaust
    « Reply #10 on: August 13, 2015 - 12:31:58 PM »
    Thx for thew answers about the diameter.
    I wish I knew this earlier.
    Already have installed and 2.5 exhaust.

    Alvin
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    Offline FCC

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    • 1973 Dodge Challenger 340
    Re: dual exhaust
    « Reply #11 on: August 20, 2015 - 01:53:55 PM »
    I bought this for my 340...

    http://www.ebay.com/itm/1971-1974-DODGE-CHALLENGER-EXHAUST-340-360-ENGINES-WITH-RESONATORS-/181840758862?hash=item2a568dc84e&vxp=mtr

    But they may have an option for a 318. 

    Install was straight forward and it fit pretty well.  Well, it was my first exhaust install, so can't compare. :)

    Their website is http://classicexhaustinc.com/ but seems outdated.
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    Offline Tommy D

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    Re: dual exhaust
    « Reply #12 on: August 30, 2015 - 11:02:39 PM »
    Just take a ride to the local shop and have them install something for you.... its cheap and you save on shipping.
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    Offline anlauto

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    Re: dual exhaust
    « Reply #13 on: August 30, 2015 - 11:04:55 PM »
    Wasn't there a guy on here selling exhaust off of his Mom's car ? :-*
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    I've taught you everything you know.....but I haven't taught you everything I know !
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    Offline dfrazz

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    Re: dual exhaust
    « Reply #14 on: August 31, 2015 - 07:54:08 AM »
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