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C14 Muffler - Cat removal

Discussion in 'Cal 1400 8V' started by Clayton Sietsema, Mar 14, 2016.

  1. roadventure

    roadventure High Miler GT Famiglia

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    Clayton,

    You're going to have to "beat me on the head" with this one...

    HOW did you get the catalyst out of the stock muffler?
     
  2. Clayton Sietsema

    Clayton Sietsema Cruisin' Guzzisti

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    Ok, that makes sense. Do you often switch back and forth mufflers? How to... take a cut off wheel on a hand grinder and cut the front of the muffler off at the factory weld, then take a 4 or 5 inch lag bolt and thread it in to the center of the cat, use a slide hammer and drive it out and weld the front of the muffler back on. make sure you put timing marks on the two pieces so you have them clocked just right when welding them back together. Since you don't care about sound you can leave the front baffle in.
     
  3. roadventure

    roadventure High Miler GT Famiglia

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    Thanks. That helps a lot!

    I have had the stock mufflers on for a while and liked them, but then got a new rear tire and put the Mistrals back on. I think the stock mufflers are going to stay on and the Mistrals will be go up for sale.
     
  4. GTM®

    GTM® Administrator Staff Member GT di Razza Pura

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    You also have to drill out the tack welds on the back end of the cat plate.
     
  5. Perk5560

    Perk5560 Tuned and Synch'ed

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    Hi Clayton,

    I'm wondering with your experience having the modified (gutted) stock mufflers installed did you feel a need to do any fuel modifications because of the change? I know Todd feels a fuel modification is in order for any changes (including stock) in the mufflers but I would like your opinion if I could hold off for now on the fuel mods and the bike still run reasonably well.

    Thanks,

    Dave
     
  6. Clayton Sietsema

    Clayton Sietsema Cruisin' Guzzisti

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    Sorry Perk, I had already done Todd's fuel mods prior to gutting the mufflers. But.... of all the mods I have done to the bike the fuel mods were the single best investment as far a the bike running better. I highly recommend it before any exhaust mods. I know it's a lot of money but it's worth it. But know this, the fuel mileage sucks balls at anything over 70mph now and what's worse is my running buddy always runs 85 down the interstate. I might get 30 mpg at that speed.
     
  7. Perk5560

    Perk5560 Tuned and Synch'ed

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    Thanks for getting back with me and your brutal honesty on the mpg. Please tell me that was with 2 up riding since that is probably 85% of what I do.

    I guess now this leads to another question. What exactly were the fuel mods that were done on your bike?

    Thanks,

    Dave
     
  8. GTM®

    GTM® Administrator Staff Member GT di Razza Pura

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    While these are certainly thirsty motors, and worse when the air temps are cooler, pull and send me the PC-V map, and I'll make some tweaks.
     
  9. GTM®

    GTM® Administrator Staff Member GT di Razza Pura

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  10. Clayton Sietsema

    Clayton Sietsema Cruisin' Guzzisti

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    Perk, my fueling mods are Todd's full shebang minus exhaust. And 2 up doesn't seem to affect my mileage nearly as much as speed does.

    Thanks Todd, will do as soon as I get her back from Mi.
     
    GTM® likes this.
  11. buzglyd

    buzglyd Cruisin' Guzzisti

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    I recently had Todd perform the cat removal on my Custom.

    I have to say I'm totally pleased. There is a little more rumble at idle and a slight higher tone was added at freeway cruise. I was not looking for loud. This is perfect to my ears. Plus, she runs a little cooler.

    I already have the fuel injection system installed and Todd even gave that a second look which is now even cleaner running than before.

    I'm totally satisfied. Now I might take a look at the rear suspension adjustment. Or maybe slow down! ;-)
     
  12. Rocco1400

    Rocco1400 Just got it firing!

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    Thanks for all the information, seems like there's a few of us like the original lines but want a little more sound.
     
    John L likes this.
  13. PaulDavies

    PaulDavies Cruisin' Guzzisti GT Contributor

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    anyone just drilled the back baffle, i.e. left internal baffle and Cat in place. Would be interested to hear what that sounds like
     
  14. dte8dom

    dte8dom Just got it firing!

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    Did you ever get around to drilling out the end baffle? And if so what size hole did you end up with?
     
  15. Clayton Sietsema

    Clayton Sietsema Cruisin' Guzzisti

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    Pretty sure I went with a 1" bit. I took a piece of 1" CRS and turned one end down to fit a 1/2" drill and tacked the other end to a drill bit. Worked well.
     
  16. GTM®

    GTM® Administrator Staff Member GT di Razza Pura

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    Thanks Brad, but as it says, email me to that address. Publishing pricing here always bites me as people search this years later and ask why it's more expensive, often 5+ years later.
     
  17. Brad Becker

    Brad Becker Just got it firing!

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    Hello , I think your bike sounds awesome , if it is the one I have heard on Youtube ? I think I will be sending mine in as well .
     
  18. buzglyd

    buzglyd Cruisin' Guzzisti

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    yes I posted a you tube video. I like it. Plus, I still have the totally stock look.
     
    Brad Becker likes this.
  19. Brad Becker

    Brad Becker Just got it firing!

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    Ya , I would like to keep the stock look on my Eldorado but need more sound . Now i just have to wait for the weather to warm up to get them removed . Still very cold here in these parts of the woods .
     
  20. Skip Stauber

    Skip Stauber Just got it firing! GT Contributor

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    Hello All I'm new here as I just got myself a C14c. Fantastic forum, great way to share ideas and get info.. I just bought the computer flash setup ( can't wait till it comes ) from GTM. Meanwhile I want to mod my stock mufflers per video. I've read everything about it on this thread, but would like a little more descriptive detail, pics, ect, back plate mod maybe. Can more be done for a deeper tone? All comments would be very appreciated. Cheers!
     

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