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Sportster Motorcycle Air intake, Carburetor, EFI, Fuel, and Exhaust Problems, advice and/or how tos for Sporster and Buell motorcycle carburators, Electronic Fuel Injection (EFI), Air Intake, Fuel and Exhaust.

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  #1  
Old 5th October 2019
11alan111 11alan111 is offline
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Default exhaust

if i renew the exhaust what do i do with the catalist?
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  #2  
Old 5th October 2019
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Keep it. You never know when the politicians will get stupider & make you get the bike inspected, if you don't have to yet.
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Old 5th October 2019
11alan111 11alan111 is offline
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Quote:
Originally Posted by BKB View Post
Keep it. You never know when the politicians will get stupider & make you get the bike inspected, if you don't have to yet.
what i mean is do i have to replace it or tell the bike anything
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Old 5th October 2019
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Tell the bike you are taking the Cat off if you wish, but don't expect much of a reply!

As BKB say's, just keep your old system just in case.
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Old 6th October 2019
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On the EFI bikes, just replacing or modifying the exhaust doesn't require any ECU changes. The ECU can compensate for that little bit of a change with no further intervention. I've got custom baffles in stock mufflers & an Arlen Ness Big Sucker air filter set-up & have no other mods on the motor or ECU & it runs just fine. No popping on decel, doesn't seem to run hot, 46 mpg & a top speed of about 115 mph.
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