Exhaust system ideas

Discussion in 'Wrenchin' Secrets' started by Rahnz Wildcat, Jun 7, 2020.

  1. Rahnz Wildcat

    Rahnz Wildcat Active Member

    Wondering how you guys are exiting your exhaust on your 1965 2 door Wildcats. If I understand correctly, factory is straight out the back on either side of the gas tank. Any other options working that don't cause fumes in the car, or a serious drone?
     
  2. LARRY70GS

    LARRY70GS a.k.a. "THE WIZARD"

    I think the mufflers you choose have way more to do with drone than where your tail pipes exit. Seems to me that straight out the back is best. For a 2 1/2" system, it is hard to beat the Walker 17749 mufflers, unless you like loud Flowmasters that will likely drone.
     
    pbr400 likes this.
  3. Rahnz Wildcat

    Rahnz Wildcat Active Member

    Not familiar with the Walkers. I'll check them out. I want that loud deep throaty sound but not ridiculously loud. Thanks for the feedback.
     
  4. LARRY70GS

    LARRY70GS a.k.a. "THE WIZARD"

    The 17749 are relatively quiet at idle and cruise, but scream when you are on it. I had them when my exhaust was 2 1/2". When I went to 3", I went with the Magnaflow 14264. Same characteristics, relatively quiet until you get on it.
     
  5. flynbuick

    flynbuick Super Moderator Staff Member

  6. pbr400

    pbr400 68GS400

    You may think Walkers are too quiet at first but you’ll learn to appreciate them. You may like Floorblasters at first but you’ll probably end up hating them!
    Patrick
     
  7. johnriv67

    johnriv67 Well-Known Member

    Never forget Dynomax Ultraflows

     
    GS464 likes this.
  8. gs65

    gs65 Active Member

    I have the Dynomax super turbos, lasted a long time and seem to get louder with age
     
  9. racenu

    racenu Well-Known Member

    I just order a dual system from Waldron with a Flowmaster 50 series muffler for my 69 cat. They don’t do 2 1/2” so 2 1/4” will have to do, don’t want a loud or drone system, they seem very knowledgeable.
     
  10. CMCE

    CMCE Well-Known Member

    racenu- Which 50 series did you get, Delta or Super? The Super is the quietest of the two and less likely to drone.
    Word of caution to those who have final axle ratios in the mid 2's to lower 3's- your 50-65 mph cruising rpm is right where drone usually happens- 1800-2400 rpm. Chambered mufflers are the worst drone offenders, with the exception of the Super 50 and 70 series FM as they are designed to specifically reduce drone. Most, but not all, straight-through mufflers have a tendency to drone. General consensus is that MagnaFlow has the best drone control of the perforated pipe, straight-through mufflers. I've had few customers complain of drone with MagnaFlows, but it does happen. Your best bet against drone is to follow the advise of Larry70GS and use a Dynomax Super Turbo muffler. They come in various case lengths so you can choose your sound level. I personally switched from a straight through muffler to Dynomax #17749 (20", 2.5" offset/offset) on my 406 Chevelle with 2:56 gears and it completely eliminated the drone.
     
  11. LARRY70GS

    LARRY70GS a.k.a. "THE WIZARD"

  12. CMCE

    CMCE Well-Known Member

    Yeah drone is a funny thing. Cut open a MagnaFlow and it looks pretty much like most straight through mufflers, but they do control drone far better than most of the others. As far as Dynomax Super Turbos, 99% of the time they control drone, but there's always that 1%. I sold a pair to a guy with a '66 B-body Mopar with a bored & stroked 383, big cam and 10.75 compression. He bought a pair of 20"(#17748), which is the same as 17749 only with a center outlet. The noise level and tone is perfect- quiet but still very snotty. He gets compliments wherever he goes. But the car drones so bad his wife won't go with him anymore. He's added resonators and even put 2.25" tails on to no avail. This is why I no longer use the words 'never' and 'always' when describing how an exhaust is going to sound. Too many variables!
     
  13. Redmanf1

    Redmanf1 Gold Level Contributor

    Good info^^^^
     
  14. Golden Oldie 65

    Golden Oldie 65 Well-Known Member

    I've got Walker 17749 with 2 1/2" on my Skylark and everything that has been said here is all true, they've got a nice sound but not too loud at idle and cruise but open up great when you hit the go pedal hard. And no drone. I also have an X pipe, which quieted it down a little more when I installed that.

    I have Flowmaster Super 50s with 2 1/2" on my big block El Camino and I love the sound of that car. Not too loud but certainly noticeable with very nice tone. However, I do get a slight drone right at 50mph. Not annoying but noticeable if you pay attention. That car has 3.08 gears so that slight drone would take place at a different speed, up or down, depending on your gear ratio. It's also possible that mine being an open bed might have something to do with it and may not even happen in a full size, full interior car.
     

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