Slip-On Mufflers only
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Road Master
Joined: Jul 2006
Posts: 886
Likes: 4
From: Virginia
Slip-On Mufflers only
I have a friend who is looking for more sound out of his 07 FLHT but don't care about performance. I thought I read somewhere in here that you can change mufflers only and the fuel system will adapt but I can't seem to find it. Is this true?
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Road Master
Joined: Jul 2006
Posts: 886
Likes: 4
From: Virginia
Does it matter which mufflers you go with? I think he wants something that is loader than stock, something a small amount above SE slip-ons.
Stellar HDF Member
Joined: Sep 2009
Posts: 3,351
Likes: 1,936
From: Formerly Tampa Bay, FL, Currently Western PA
If you change the inlet or outlet to the engine (air cleaner or exhaust), you will allow more air into the engine, thus making the engine run leaner as it is using the same amount of fuel. However, if you have an O2 sensor, it basically sniffs the exhaust to determine the fuel/air ratio and correct as needed by dumping in more or less fuel. So, for minor changes it should be OK. However, the stock CPU can only change it so much as it was designed to run with the stock exhaust, so the software parameters are very narrow. Basically, it might try to richen it up some, but if you put an air cleaner and full system on it will still be much too lean.
If you don't have O2 sensors, then your fuel map will not be changed at all by change the air cleaner or exhaust.
So, yes, he should be good with some mild slipons. But, I would recommend paying close attention to the temp of the engine for awhile afterward. If he puts them on, and the oil temp jumps 20 dregrees or there is some bluing on the head pipes, then put a PC or VH FP on there.
Ultimate HDF Member
Joined: Dec 2007
Posts: 9,254
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From: Lake City, Florida (Native)
With good slip ons and XIED's will run fine but increase the size of the Air Intake .. Is Remap Time ..
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Tourer
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Stellar HDF Member
Joined: Oct 2007
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From: Kentucky
The dealer where I just bought my bike says that slip-ons and no other changes are just fine. They recommend SE's or Rush with 1 3/4 baffle. They said either of these mufflers will work (Rush sounds better) and will not void any warranty claims. They said if I go with baffles larger than 1 3/4 I would be better with the SE air filter and down load or SE Race Tuner.