Go Back   Harley Davidson Forums > Harley Davidson Motorcycles > Touring Models
Sign in using an external account
Register Forgot Password?
Search


Touring Models Road King, Road King Custom, Road King Classic, Road Glide, Street Glide, Electra Glide, Electra Glide Classic, and Electra Glide Ultra Classic bikes.
Sponsored by: Fuel Moto USA

Welcome to HDForums.com!

Reply
 
 
 
P
 
Thread Tools Search this Thread
  #1  
Old 03-11-2012, 01:43 AM
Joboo1966's Avatar
Joboo1966 Joboo1966 is offline
Road Master
Join Date: Aug 2010
Location: Wabash
Posts: 770
Default Removing the cat from your bike.

I know a lot of you folks with bikes with the stupid EPA mandated cat converters out there wonder if taking out the cat will increase performance and sound. While the answer to this question is somewhat subjective, I want to share a video illustrating the reaction of a guy who did just that. As you will see the removal of the cat made barely any difference in loudness. Abe the rev tone was deeper but he does not seem too happy with the results considering the amount of time invested.

It is my opinion that removing the cats alone is not going to help much. You must , if you decide to do so, follow up with new pipes and probably new head pipes , to really notice performance and sound differences worthy of the time invested. Many also say that you can keep the cat , change the pipes, and depending on replies accompesvgetting very good sound for a fraction of te time and labor spent removing just the cat....which looks like a pain in the *** anyway

God luck fellas. http://m.youtube.com/?appcache_off=1...?v=YT6o1FouizM
__________________
You can't explain the feeling of what it is to ride...you either get it or you don't .
Reply With Quote
  #2  
Old 03-11-2012, 06:28 AM
Pine Tree's Avatar
Pine Tree Pine Tree is offline
Outstanding HDF Member
Join Date: Oct 2007
Location: Central Maine
Posts: 2,286
Default

Quote:
Originally Posted by Joboo1966 View Post
I know a lot of you folks with bikes with the stupid EPA mandated cat converters out there wonder if taking out the cat will increase performance and sound...
Just about everyone I know that's removed the cat (myself included but I did via a header replacement) did so for the purpose of decreasing the heat put out by the cat.

Performance and sound seems to be down way down the list of objectives.

And that's for the youtube link...don't know what the tsunami vids has to do with this topic but thanks anyway
__________________
Member - 8th & I Association
Reply With Quote
  #3  
Old 03-11-2012, 07:03 AM
blockzilla blockzilla is offline
One Of The Regulars
Join Date: Jul 2011
Location: my house
Posts: 245
Default

removal of the cat (as mentioned above) is done to reduce the heat on the bike... not for sound or performance , new slip ons will give a deeper louder sound if thats what a person is looking for ...and as far as time invested ? whats a couple hours of easy work compared to a lifetime of not dealing with a bike so hot your passenger complains everytime they are on it .... Cat removal / one of the best things you can do to the new bikes ....
Reply With Quote
  #4  
Old 03-11-2012, 07:49 AM
bigdogx's Avatar
bigdogx bigdogx is offline
One Of The Regulars
Join Date: Jan 2010
Location: newport tenn
Posts: 135
Default cat

This is true, when i cut the cat out, heat droped quite a bit, got better sound with a night stick, and it only took a couple hours.
__________________
2010 streetglide, scarlet red, no mods yet, still thinking, o:k a few mods done.
Reply With Quote
  #5  
Old 03-11-2012, 08:37 AM
SDLS's Avatar
SDLS SDLS is offline
Hang Around
Join Date: Dec 2008
Location: Northern New Jersey
Posts: 44
Default

I removed the CAT, and did a Db comparison with and without. There was a 1 or 2 Db increases @ idle. I couldn't do a test @ 2500 RPM because I had no one here to turn the throttle while I held the phone.

This is what i know while riding.

The bike is louder, by how much I don't know.
Is there less exhaust restriction? yes.
Do I have better throttle response I believe so.
Is there less heat? yes.
Would I cut it out again? yes I would.

When I cut the cat open there was fine sentiment (crap) trapped between the metal plates. Will this build up over time ? I don't know.
So far I don't see any issue with the CAT being out

With_CAT-Warm
http://youtu.be/wdAIilLAjHA

Without_CAT-Cold
http://youtu.be/KNAj545lrE4

Without_CAT-Warm
http://youtu.be/qEzGVRRufD8


SDLS
__________________


2012 FLHTK
2009 XL 883/1200C
Reply With Quote
  #6  
Old 03-11-2012, 08:40 AM
Gunnysgt's Avatar
Gunnysgt Gunnysgt is offline
Road Warrior
Join Date: Oct 2009
Location: Southeast Pa
Posts: 1,325
Default

Performance wise, removing the Cat will not give you the performance boost an after market 2-1-2 will give you either. Will it run cooler, I would suspect so but I wouldn't expect much other change
__________________
2013 Road King FLHR
Way too Many Mods to list
2014 Ultra Limited FLHTK
Best Freakin Harley I ever owned
Reply With Quote
  #7  
Old 03-11-2012, 08:51 AM
Lowcountry Joe's Avatar
Lowcountry Joe Lowcountry Joe is offline
Club Member
Join Date: Sep 2007
Location: Near Myrtle Beach, SC
Posts: 4,375
Send a message via Yahoo to Lowcountry Joe
Default

It's worth the effort just to remove the concentration of heat in the area of the CAT. Ask anyone that has been on any parade rides, or in slow traffic on a summer day.

As for the performance after CAT removal, well you are dealing now with a modified Harley stock header that is not very good in the first place. There won't be much if any substantive performance gain from a simple cat removal. Reduced heat, a little different sound, and a few new places for the stock to start rusting (the welds).

After taking the stock header off, I would never put it back on. Aftermarket 2-1-2 or 2-1 is the ticket. Then you have a good base on which to build your various stages of performance upgrades. You pay a lot for the bike. Don't skip on the small stuff.
__________________
2010 Limited FLHTK
Reply With Quote
  #8  
Old 03-11-2012, 08:57 AM
dan conner dan conner is offline
Ultimate HDF Member
Join Date: Apr 2010
Posts: 5,065
Default

removing the cat and adding xied's made my bike more enjoyable to ride...not looking for a performance increase.
Reply With Quote
  #9  
Old 03-11-2012, 09:00 AM
stewy1200c's Avatar
stewy1200c stewy1200c is offline
Road Captain
Join Date: Mar 2008
Location: Northern N.H.
Posts: 532
Default

Quote:
Originally Posted by Joboo1966 View Post
It is my opinion that removing the cats alone is not going to help much. You must , if you decide to do so, follow up with new pipes and probably new head pipes , to really notice performance and sound differences worthy of the time invested.
The heat is the many issue, Sound is better , deeper and louder with a new slip-on. mine was for sure. Why would you remove the cat and then follow up with a new head pipe? That would be a waste of time.

I bought a take off head pipe from a fourm member, de-cated it had my Indy tig weld it back together with SS wire so it wont rust. Took a total of 2 hrs (including beer breaks) and spent a total of $75. Very happy with the out come, and would do it again.
__________________

2010 Road King
SE Stage 1 Cat removed
Fuelpak, V&H Twin Slash Rounds
Wild1 518"s
Little of this Little of that

Last edited by stewy1200c; 03-11-2012 at 09:07 AM..
Reply With Quote
  #10  
Old 03-11-2012, 09:18 PM
OldFordTrk1's Avatar
OldFordTrk1 OldFordTrk1 is offline
One Of The Regulars
Join Date: Nov 2011
Location: South Carolina
Posts: 125
Default Heat reduction

Removing some heat from my foot and leg was my motivation to cut the cat out. It was my first mod too. Would do it again. I also liked the deeper sound it gave me also.
Reply With Quote
Old 03-11-2012, 09:18 PM
 
 
 
P
Reply

Tags
2012, 883, bike, cat, cats, eliminating, harley, heat, reduce, removal, remove, removing, stock, touring, video, welding


Thread Tools Search this Thread
Search this Thread:

Advanced Search

Posting Rules
You may not post new threads
You may not post replies
You may not post attachments
You may not edit your posts

BB code is On
Smilies are On
[IMG] code is On
HTML code is Off
Trackbacks are Off
Pingbacks are Off
Refbacks are Off

Forum Jump

Advertising
Featured Sponsors
Vendor Directory
Sponsors

All times are GMT -5. The time now is 10:32 AM.


Internet Brands, Inc.



Search Engine Optimization by vBSEO 3.6.1