The overall length of the pipes does play a role in the performance of an exhaust. The longer the pipes are the more back-pressure is created, so the baffle can be shorter. The trick in designing longer pipes or any exhaust is equalizing the back-pressure. The front head pipe is longer than the rear head pipe in most designs, so now you have un-equal back-pressure. The baffles are designed for each front and rear pipe to equalize the back-pressure. So what happens when you pull out the baffles or modify the baffles! The back-pressure is now reduced and not equal to the front and rear pipe. This causes the motor to work harder. Gas is shot in to the intake manifold and being un-equal pressure from the exhaust causes one cylinder to get more gas than the other making the motor run less efficiently and run hotter. This basically happens in all V-twin motors because of intake manifold design. You can see it happen during Dyno testing.If I lost at performance, then I sure didn’t notice. I am quite certain there is truth to these statements. Could the overall length of these pipes have anything to do with it?
I tried to resist, but well, I just can't. No disrespect to anyone who thinks otherwise, but... I've seen proof of a lot of things that loud pipes do; damage hearing, piss off the non riding public, attract the attention of police officers, get noise ordinances passed, etc... but I've never seen any proof that they save lives.... “Loud pipes save Lives” The general public often times don’t see riders, but they do hear them with aftermarket pipes. It makes them take notice and be aware of the motorcyclist.
I agree, Walt got it correct. Also, good info from Doug and Cobra. Thanks for the informative post.I think Walt has got it right. I would hope that an alert rider would not be on the throttle making exhaust noise when there is imminent potential for sharing your space with another vehicle unless you are using the throttle to get away and then it becomes a moot point .
If it's a warning noise you feel the need for there is nothing more effective than a pair of loud American car horns which are far more startling than the constant roar of a loud exhaust . Not to mention the fun you can have 'cuase the inattentive driver suddenly wonders where the f..kn' big truck is that's bearing down on him . That alone should satisfy even the hardened antisocial biker . If you love an excessively loud exhaust just admit it rather than hide behind a bogus excuse to justify it .
I still feel if you need to rely on another driver hearing you to avoid hitting you, then you've already lost the game.There are many articles about this, but here is one from:
T Jaussaud Harley Davidson Examiner
Do loud pipes save lives?
Although it hasn't actually been proven to be true, many bikers believe this is a fact.
The motorcycle officers with the Oakland police department obviously believe it too! They have dumped the toned down stock Harley exhaust pipes and equipped all 45 of their Harley Davidson’s with pipes that put out a roar at 93 decimals, well above the federal standard of 80 decimals. In a statement explaining the department’s decision, Chief Dave Kozicki said, "There's an old motorcycle adage that you are heard before you are seen." I’ll bet those cops are happy campers!
Chief Kozicki also mentioned an incident where a motorcycle officer was struck, while riding a bike with the stock exhausts by a motorist who later claimed he hadn’t heard the officer coming.
I guess Oakland’s motorcycle cops are known to ride their Harleys with loud pipes, so much so they were labeled with the nickname “Rolling Thunder” until one officer reported having hearing loss problems. That along with citizen complaints caused the department to switch to stock Harley Davidson exhausts.
Many of the motorcycle officers then complained that they didn’t feel safe riding with the stock pipes. So the department and the cities risk management department did a study. The findings were unreliable. So they decided it would be in the officer’s best interest to switch back to the louder exhausts.
Well put! Now all we have to deal with beside the yakking on cell phones is texting... It appears that you are 8 times more likely to be involved in an accident while texting. While drunk driving you are 6 times more likely. Nice huh?