02-26-2018, 09:35 PM | #1 |
Join Date: Dec 2017
Posts: 216
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catalytic converter question
Hi, this is a picture of an exhaust header off my Hellcat. The bulge in the middle is a catalytic converter. I imagine it is packed with some type of material that restricts the flow. Is there any way I can remove the material without cutting my pipe?
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02-26-2018, 10:31 PM | #2 |
Join Date: Sep 2017
Location: N Texas
Posts: 706
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I do not think so. Might be easiest to cut the cat out and put in a piece of straight pipe.
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02-27-2018, 01:16 AM | #3 |
Join Date: Oct 2013
Location: Leesville SC
Posts: 835
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JerryHawk has a thread about how to do it. Search his posts. I believe he made a three sided cut, folded the flap back, removed all the cat guts and then folded the flap back down and welded it up. Let me see if I can find the thread.
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02-27-2018, 01:21 AM | #4 |
Join Date: Oct 2013
Location: Leesville SC
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Nevermind, Jerry cut the cat in two. But I remember someone on here did it the way I described. Here is Jerry's thread. I know this isn't what you want but its probably the only way to gut the Cat.
http://www.chinariders.net/showthread.php?t=17913
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02-27-2018, 02:12 AM | #5 | |
Join Date: Dec 2017
Posts: 216
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Quote:
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02-27-2018, 08:01 AM | #6 |
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Location: Houma, La.
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That would be the best solution. I kept the cat housing for two reasons. First being i wanted to keep the mounting points for the heat shield. Second was i didn't have a piece of pipe laying around that was the right size. You go by one of the local muffler shops and have them cut and weld a piece of pipe on there for you or just piece of exhaust pipe and use muffler clamps.
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2024 Linhai 300 ATV 4x4 2023 Lifan Lycan 250 Chopper 2023 Venom Evader 2022 Lifan KPX250 2020 Kawasaki Vulcan S (Sold) 2004 Honda ST 1300 2016 Black Hawk 250 (sold) Keihin PE30 carb,125 main,38 slow.Pod filter,ported & decked head 10:1 CR,Direct Ignition Coil,15/40Sprockets,NGK DPR8EIX-9,De-Cat,Dual Oil Cooler,Digital Cluster 2016 Cazador180 XL 2014 Coolster150 JerryHawk250.com My YouTube Channel |
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02-27-2018, 10:58 AM | #7 |
Join Date: Mar 2009
Location: Sardis, BC, Canada
Posts: 25,977
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If you cut 3/4 of the way around the pipe, you won't lose the overall length or configuration of the stock exhaust. If you have someone cut the offending section out and replace it with a new piece of tube, it might end up being the wrong length, the bolt holes might not line up or the mid-pipe might not meet the muffler.
It's much better to take the time to cut 3/4 of the bulge out and remove the cat yourself. That way, you can hand the whole deal to a welder and simply instruct him to weld the window back in. It's also much easier for him that way and is likely to cost you less. If you brought it to me like that, I'd do it for free.
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02-27-2018, 11:35 AM | #8 | |
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2024 Linhai 300 ATV 4x4 2023 Lifan Lycan 250 Chopper 2023 Venom Evader 2022 Lifan KPX250 2020 Kawasaki Vulcan S (Sold) 2004 Honda ST 1300 2016 Black Hawk 250 (sold) Keihin PE30 carb,125 main,38 slow.Pod filter,ported & decked head 10:1 CR,Direct Ignition Coil,15/40Sprockets,NGK DPR8EIX-9,De-Cat,Dual Oil Cooler,Digital Cluster 2016 Cazador180 XL 2014 Coolster150 JerryHawk250.com My YouTube Channel |
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03-01-2018, 02:07 AM | #9 |
Join Date: Dec 2017
Posts: 216
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Thank you guys for all the great advice! Reading various articles on the net, there seems to be a lot of debate as to whether removing the cat is all that beneficial, as far as gaining more power. One thing that appears to be clear is that it will make your exhaust louder if you remove it. I installed an aftermarket
performance muffler and I like the way it sounds, not that loud with the db killer in, and I want to keep it that way, so I decided just to leave it be for now. Thanks |
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03-04-2018, 05:38 PM | #10 |
Join Date: Dec 2016
Posts: 269
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I cut three sides and peeled it back and dug out the mess then folded it back over and welded it. The toughest weld job I've ever done. That metal is terrible to work with. I posted pics in my build thread (probably 50 pages back in the archive by now). As far as performance benefits..... by far the best thing I ever did to my Hawk. Coupled with re-jetting the carb and modifying the air box it really made a big difference. The catalytic converter doesn't come out easy tho
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