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post #1 of 134 (permalink) Old 01-01-2016, 03:09 PM Thread Starter
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I've been back and forth over removing the catalytic converters a hundred times. Taking care of the heat issue is my priority before next season, I have no intention of wasting anymore time playing with air flow, fins, lowers or anything else. (For anyone who doesn't know: since tuning my bike, the cats have been over heating and it a blast furnace riding in warmer temps).

I planned to bite the bullet and get a new exhaust system, but after talking with some buddies and a little research, I decided once and for all to de-cat my stock exhaust. I already had the wheels and mufflers off so now was the time, I just went out this afternoon and did it.

The job was fairly easy, I drilled out a center hole, then around the entire edge of the cat making holes as close as I could get. I tapped in a small chisel around the perimeter to break it loose and get any remaining pieces off the edges. The cat material is highly magnetic, which made clean up a snap, I just ran a magnetic screwdriver around the inside of the pipes a few times, which collected all the excess shavings and splinters.

Now...I'll have a wait a while to see how this will go. I have two major concerns. One is excessive noise, my Miller Mufflers are pretty much straight through and have a 2.5" exhaust port, the noise level could be over the top. The other is low end power loss and this is my main concern. I'm very anxious to get the bike together and test this out but it may be months, all depends on how soon I get my new tires on and fork service done and the weather, of course.

If I no likie, I'll just go back to my original plan of getting a new exhaust.


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post #2 of 134 (permalink) Old 01-01-2016, 03:42 PM
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Quote:
Originally Posted by PaiN View Post
I've been back and forth over removing the catalytic converters a hundred times. Taking care of the heat issue is my priority before next season, I have no intention of wasting anymore time playing with air flow, fins, lowers or anything else. (For anyone who doesn't know: since tuning my bike, the cats have been over heating and it a blast furnace riding in warmer temps).

I planned to bite the bullet and get a new exhaust system, but after talking with some buddies and a little research, I decided once and for all to de-cat my stock exhaust. I already had the wheels and mufflers off so now was the time, I just went out this afternoon and did it.

The job was fairly easy, I drilled out a center hole, then around the entire edge of the cat making holes as close as I could get. I tapped in a small chisel around the perimeter to break it loose and get any remaining pieces off the edges. The cat material is highly magnetic, which made clean up a snap, I just ran a magnetic screwdriver around the inside of the pipes a few times, which collected all the excess shavings and splinters.

Now...I'll have a wait a while to see how this will go. I have two major concerns. One is excessive noise, my Miller Mufflers are pretty much straight through and have a 2.5" exhaust port, the noise level could be over the top. The other is low end power loss and this is my main concern. I'm very anxious to get the bike together and test this out but it may be months, all depends on how soon I get my new tires on and fork service done and the weather, of course.

If I no likie, I'll just go back to my original plan of getting a new exhaust.

[IMG]http://i181.photobucket.com/albums/x298/Mikepain_pics/Message_1451674806702_resized.jpg[/IM
Maybe Apples to Oranges here, I removed the cats on my Tri-Glide and added slip-ons, Lost bottom end power and way too loud..
Added a pair of Thunder Torques from DK Custom. Got back bottom end big time and toned the sound down.. Been riding with them for a few years now.. Some of the old street rod guys call them Lolly-Pops...

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post #3 of 134 (permalink) Old 01-01-2016, 03:47 PM
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you will be fine i removed mine 2 years ago and only a dyno could tell you a difference and i lost alot of heat.
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post #4 of 134 (permalink) Old 01-01-2016, 03:55 PM
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doubt it will be much louder. Your ATS should make up for low end.
Think you'll be just fine.
Spray some WD40 on muffler opening before you put on pipe. It will slide right on and hurt nothing.

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post #5 of 134 (permalink) Old 01-01-2016, 04:02 PM
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I think you'll be fine. Hopefully it does something for your heat issues.



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post #6 of 134 (permalink) Old 01-01-2016, 04:52 PM
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It will be a long winter waiting for these results Pain. I too am considering removing the cats. I have had a very similar experience to Pain's XCT heat issues. I have tried to do everything in an effort to reduce heat felt. Just learning about the Thunder Torque inserts.... seem like a nice solution to regain some loss bottom end and reduce any added sound as a result of removing the cats.

For those who have removed the cats, did you notice a large increase in sound? I could handle a slight increase, but really don't want much more volume. Most posts I have read have never really mentioned a big increase in loudness.

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post #7 of 134 (permalink) Old 01-01-2016, 04:58 PM
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I was talking about it to PaiN today before he did it; mentioned that I didn't notice a significant increase, but I also had OEM mufflers, too...



2013 XCT, Boardwalk Blue w/ Vicwrapz
S&S Cams, Lloydz filter & ATS +5, PCV, UD pulley, Alto Red Eagle clutch plates
Madstad Windshield, 5000K HID, TriOvals, Memphis Shields wings, Ultimate seat
JVC KD-X35MDT, PBR300X4, Polk DB6502, DaytonAudio ND140-4 rear
HyperLites, LED driving lights, Lloydz dyno 105+H and 117+T
Arlen Ness blinkers, KlockWerks KlipHanger bars, Avon grips

Spectro Golden 4 20w40 for Victory L.SG424, Kury Sabertooth LEDs
THE FEW, THE PROUD, THE OBSCURE. TTWFO2
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post #8 of 134 (permalink) Old 01-01-2016, 05:25 PM Thread Starter
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Quote:
Originally Posted by visionjohnny View Post
Spray some WD40 on muffler opening before you put on pipe. It will slide right on and hurt nothing.
Helps getting pipes off too...

Quote:
Originally Posted by broggyr View Post
Hopefully it does something for your heat issues.
Those cats caused me a lot of headache.....I gave them the finger after I dumped them in the trash.

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Corbin Dual Tour seat, Klock Werks Klip Hanger bars, Vicwapz
Avon Contour grips, Kuryakyn Kinetic boards and rear SwingWings
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Last edited by PaiN; 01-02-2016 at 05:50 AM.
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post #9 of 134 (permalink) Old 01-01-2016, 06:10 PM
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For one thing... you just blew that dyno tune you paid for. Does it really get that hot in Connecticut? I mean, it's not like you ride in 120 degree temps in Arizona.

Secondly... now that my best friend has a dyno and we have done a LOT of testing... we both say all the time, "Just when we think we know something about exhaust tuning, we learn that we really know nothing about exhaust tuning". It's SO TRUE.

However, on most machinery we have played with, the factory head pipes and some relatively small diameter slip-ons out-perform a full replacement exhaust system... As long as the engine is not radically modified. The Victory baggers, the HD baggers, same story. The cats don't seem to hurt, but actually help, in cases where just breathing mods or breathing mods and cams are done.

It was long thought by my friend that THOSE CATS MUST GO! but he has changed his tune (pun intended) on that.
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Last edited by half_crazy; 01-01-2016 at 06:17 PM.
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post #10 of 134 (permalink) Old 01-01-2016, 06:13 PM
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I pulled the cats out of my XR exhaust and ran it for two or three years without em. I did it at the same time I made the thrush mufflers for it. I didn't notice power loss and the heat was somewhat less. Also, I just screwed a slide hammer right into the center of the cats and hammered them out. Very easy and simple.
Unless you are going drag racing, I doubt it will make any difference in performance.

'14 Ness XC
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