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Technical Talk -> Exhausts. 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Categories : -------------------- General --------------------Lounge.Off-Topic Lounge.For our Non-English speaking Friends.Accessories.Gear & Gadgetry.Other Triumphs.Other Bikes.Classifieds.-------------------- Technical Talk --------------------Performance Mods.Exhausts.Technical Talk.Tech Vault.How to ... step by step.-------------------- Events, Flockings, Rallies and Rides --------------------Events, Flockings and Rallies.Rides - The shorts.Rides - The longs.Short Stories - Tales from the road ... (New!) Topic : what would happen if: you replaced/emptied the cat-box to function as an expansion chamber?  Author  Post     teebird  Set Reg. Date  :  25/07/2009 Posts  :  293 Location  :  United States Posted : 17 Jul 2010 - 12:37   Post title : what would happen if: you replaced/emptied the cat-box to function as an expansion chamber?   I have read somewhere the catalytic converter has little or nothing to convert with the clean fuels available in US markets. and that the noise level for the TOR's with catalyst box removed is blattish and raw. I have the BC Hogs on my silver bike now and like them. but always wonder: what if hte cat box were emptied and reinstalled as a sound chamber/expansion chamber? the fittings could still attach the TOR or standard exhausts.  Author  Post     TraderVic  Set Reg. Date  :  02/02/2010 Posts  :  274 Location  :  Manahawkin, NJ, United States Posted : 17 Jul 2010 - 12:42   Post title : Re: what would happen if: you replaced/emptied the cat-box to function as an expansion chamber? (Re: tee   Who knows? Try it and report back.  Author  Post     ezrider3  Chaac Reg. Date  :  21/01/2010 Posts  :  505 Location  :  Maryland, United States Posted : 17 Jul 2010 - 13:01   Post title : Re: what would happen if: you replaced/emptied the cat-box to function as an expansion chamber? (Re: Tr   I agree with TRADERVIC. Try it and let us know. I too have heard that the CAT isn't really doing anything. Had to be there for import regulations. I have also read that after about the first 1000 miles it's done/useless anyway. Since you already have the Hog Slayers you have nothing to loose. Keep us posted. Inquiring minds want to know.  Author  Post     Thatch  Thor Reg. Date  :  24/06/2009 Posts  :  3,655 Location  :  Savannah, GA, United States Posted : 17 Jul 2010 - 14:05   Post title : Re: what would happen if: you replaced/emptied the cat-box to function as an expansion chamber? (Re: e   Well I don't know about it doing nothing. There's 10 pounds of nothing in that thing. I'd agree it's not very restrictive but its removal does have an effect. As for what would be the result of emptying it, couldn't tell you, worth a shot though. I've thought several times of fitting an emergency tool kit in the void where my cat was. But honestly, how much roadside meching can you do on these bikes...  Author  Post     Brian  Set Reg. Date  :  10/06/2010 Posts  :  44 Location  :  Herford, Germany Posted : 17 Jul 2010 - 14:32   Post title : Re: what would happen if: you replaced/emptied the cat-box to function as an expansion chamber? (Re:   not a lot without a laptop. Triumph gave you all the tools you need  Author  Post     daz  Zeus Reg. Date  :  12/05/2009 Posts  :  7,709 Location  :  United States Posted : 17 Jul 2010 - 14:32   Post title : Re: what would happen if: you replaced/emptied the cat-box to function as an expansion chamber? (Re: tee   Someone at RAT posted that he drilled thru the area between the inlet and outlet. I can't remember the thread but if i find it i will post it here. Someone else replied tho and said if you drill thru the material in there you will inevitably leave bits which will get sucked back into the engine and damage it. So i wouldn't do it.   2010 Blue/White Thunderbird, "Brutus". 1700 kit, short tors, gutted cat, UNI filter, filter seal off, custom tune. Brutus in his native habitat: Link  Author  Post     metalb00  Set Reg. Date  :  02/07/2010 Posts  :  343 Location  :  union, nj, United States Posted : 24 Jul 2010 - 23:22   Post title : Re: what would happen if: you replaced/emptied the cat-box to function as an expansion chamber? (Re: da   um how does it get sucked back into the engine? there is a crossover in the exhaust right behind the o2 sensors before the cat, that would kinda kill any suction cause to other pipe would be pushing out exhaust creating a positive pressure in the pipes, right? i've never heard of a properly functioning street engine suckin through the exhaust   2013 Thunderbird ABS Caspian Blue and Black Meercat crossover, D&D slipons, Black Wrapped Pipes, K&N air filter, Avon Grips, Hardstreet Slimline bags, Long haul dualseat, QR Sissy Bar 2012 Victory Cross Country Tour World Rally Blue Pearl and Obsidian Black Pearl  Author  Post     daz  Zeus Reg. Date  :  12/05/2009 Posts  :  7,709 Location  :  United States Posted : 25 Jul 2010 - 01:15   Post title : Re: what would happen if: you replaced/emptied the cat-box to function as an expansion chamber? (Re: m   i dunno....i'm just the messenger, but if it were me i would take anything like that seriously till i knew it was wrong. Too much to lose if it's not.   2010 Blue/White Thunderbird, "Brutus". 1700 kit, short tors, gutted cat, UNI filter, filter seal off, custom tune. Brutus in his native habitat: Link  Author  Post     large  Set Reg. Date  :  22/08/2009 Posts  :  168 Location  :  North Tazewell, virgina, United States Posted : 25 Jul 2010 - 01:59   Post title : Re: what would happen if: you replaced/emptied the cat-box to function as an expansion chamber? (Re:   I drilled mine through the crossover and left the ceramic in place has a much deeper sound but I also drilled about 10 1/4 inch holes in the rear baffles on stock pipes they are louder than tors under power and have a deep rumble while crusing  Author  Post     zolti  Thor Reg. Date  :  23/03/2010 Posts  :  3,127 Location  :  newcastle , United Kingdom Posted : 25 Jul 2010 - 08:13   Post title : Re: what would happen if: you replaced/emptied the cat-box to function as an expansion chamber? (Re:   large - any pics large of what the rear looks like with all the holes, ru running the tor map?  Author  Post     large  Set Reg. Date  :  22/08/2009 Posts  :  168 Location  :  North Tazewell, virgina, United States Posted : 25 Jul 2010 - 10:34   Post title : Re: what would happen if: you replaced/emptied the cat-box to function as an expansion chamber? (Re   I don't have any pics the baffle is inside the rear outlet about 8inchs deep so you can't see them well enough to get pics . I am running tors maps  Author  Post     DizzE  Thor Reg. Date  :  12/07/2010 Posts  :  3,141 Location  :  Sunnyvale, CA, United States Posted : 25 Jul 2010 - 13:37   Post title : Re: what would happen if: you replaced/emptied the cat-box to function as an expansion chamber? (Re   I saw an aftermarket solution that replaces the cat box with an 'X' shaped cross-over. That will save weight, at least.  Author  Post     large  Set Reg. Date  :  22/08/2009 Posts  :  168 Location  :  North Tazewell, virgina, United States Posted : 25 Jul 2010 - 15:02   Post title : Re: what would happen if: you replaced/emptied the cat-box to function as an expansion chamber? (Re   where did you se it at ?  Author  Post     metalb00  Set Reg. Date  :  02/07/2010 Posts  :  343 Location  :  union, nj, United States Posted : 25 Jul 2010 - 18:30   Post title : Re: what would happen if: you replaced/emptied the cat-box to function as an expansion chamber? (Re   i would love to know too!! my d&d's are on the way hopefully i can delete the cat aswell   2013 Thunderbird ABS Caspian Blue and Black Meercat crossover, D&D slipons, Black Wrapped Pipes, K&N air filter, Avon Grips, Hardstreet Slimline bags, Long haul dualseat, QR Sissy Bar 2012 Victory Cross Country Tour World Rally Blue Pearl and Obsidian Black Pearl  Author  Post     EnGage  Thor Reg. Date  :  14/07/2009 Posts  :  3,155 Location  :  Grand Rapids, MI, United States Posted : 26 Jul 2010 - 12:51   Post title : Re: what would happen if: you replaced/emptied the cat-box to function as an expansion chamber? (Re: e   ezrider3 wrote: ... I have also read that after about the first 1000 miles it's done/useless anyway... I don't what would render it useless. Catalytic Converters are not filters that clog and do not get used up, they merely provide a catalyst for a chemical reaction to occur (carbon monoxide to carbon dioxide in this case). The catalyst will work indefinitely unless a contaminate is introduced, such as lead.

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