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Incorrect. Apparently, you don't actually know "any Harley guy" with straight pipes. Most of these bikes' fuel systems are adjusted to the degree that there are different fuel maps designed for the particular Brand and Model of exhaust installed.
Obviously, you aren't familiar with performace work on motorcycles. The people that run straight pipes also tweak their fuel ratios, whether by changing jets on carbs, or adding fuel injector devices such as Techlusion, Cobra, which can only enrichen fuel mixtures, as well as others that can have custom maps downloaded from a Personal Computer. If they don't make these air/fuel adjustments, they end up with bikes performing worse than stock, and it also often ends up burning too lean...which is too hot...which burns holes in pistons. You can't tell by the sound what Motorcyclists are doing to their fuel mixtures when they change back-pressure in their exhausts (unless you hear the tell-tale exhaust popping on deceleration, which is from a too-lean condition, except for some of the engines that have a fresh-air induction system into the exhaust flow...such as the Reed-valve system on Kawasaki's).
Let me assure you there is more to it than just putting on straight pipes.
Yes, most ECU's can compensate a certain percentage from normal...but, when you add an additional abnormal variable to the situation as you decrease exhaust backpressure...whether the ECU can make adjustments for that PLUS the other variables that it needs to make, is unknown until you try it, and measure the results.
If you don't believe me, why don't you ask someone that works on them for a living? I've only personally tweaked about 15 myself. How many have you done, and how long did they last after your personal work on them?
lisaten guy, ive owned enough dirtbikes and motorcycles and been around them long enough in my life to know that most people DO NOT mess with the computer or jettings when they change an exhaust. you think the dealer adjusted the computer on my fathers 2002 harley when he brought it in to get straight pipes put on? answer is NO. i watched them put the pipes on myself. nothing except the exhaust was touched.
you think my cat elimination pipe for my 2005 bmw boxer cup sport bike came with some way to change the fueling ? answer is NO!
how about the pipe for my pops 95 bmw r1100r? no again!
did the instructions for either of these bikes mention anything about fuel adjustment? nope.
fact is that fuel injection is normally good enough to compensate for exhaust changes. n
now you can spout off about me obvoiusly not knowing this and obviously not knowing that and whatever else you feel you need to belittle me about, but i have just given a few real world examples of aftermarket exhausts which has no means to change the fueling of the engine. infact air to fuel ratio isnt even mentioned in the instruction manualss.
when i typed easlier that only carburettor engines are effected by straight pipes and other exhaust changes, i meant only NEGATIVELY effected. because basic carbs have no way to automatically compensate like fuel injection does.
