Just called M4 about the pipe as I too am interested in it. I was told the 100db @6k rpm claim is WITH the Q7 quiet insert and without the insert the increase in sound should only go up 3-4db. Not bad for a decat on this bike!
Well, I called M4 this morning. They assured me that this exhaust was designed while taking lean angle measurements into consideration, and I shouldn't worry about it touching the ground unless I drop my bike. Seemed like really nice people and took the time to answer a whole slew of questions that I threw at them.
I also watched the below video and found in the comments someone asking whether the pipe would drag, and the response seemed fairly doubtful that it would.
Post by hunkyleepickle on Apr 7, 2018 10:15:13 GMT -7
I bought the M4 not more than a week ago, install went well, noticed the actual end can mounting hole didnt quite match up with its mounting point on the bike? Needed a little persuasion, seems very solid now. Amazed at how well the bike runs without any extra tuning so far. Not a great deal of popping on decel or any flat spots or weird behaviour of any kind. I've left the sound insert in, and its plenty loud, on the verge of too loud for my taste. Definitely the best sounding and loudest bike i've had, so maybe it takes a little adjustment. Little drone at highway speeds, will definitely need to be more diligent with the earplugs when i take this thing touring. All in all very pleased, especially at half the price of an equivalent akra setup.
I found the install to be seamless and the fit/finish to be excellent. First, I loosely fitted the midpipe and muffler, then I hand tightened all bolts/nuts. The pipes do seem to have a "spring load" to them which required slight down force to install hardware, but I think that is intended with the design. The idea is to work from the front to the back with each step. After loosely connecting everything, I went back with Loctite and a torque wrench. I spent more time admiring the setup (.... AND SOUND!!) than trying to install.
I don't notice any performance difference yet. Before and after the install, the bike will power wheelie by just looking at the throttle. I do notice very slight misfires at low rpms and the 1st to 2nd gear quick shift has a little more backfire than desired. All the other quick shift gear changes sound orgasmic I will either be sending my ECU off to be flashed soon or going with the whole kit and boodle from Flash Tune or Woolich
Post by chewy1abbey on Jun 10, 2018 23:56:05 GMT -7
I'm intested in this system also I've been looking for into on it glad I came here Anyways do you have to do an ecu flash with this set up I suppose it'll run lean if you don't My biggest concern is voiding the yamaha warranty and the 5yr ext warranty I have
Has anybody found a good sound clip for the m4 exhaust? I only was able to find two on youtube, one was the dyno video and on the second video the person doesn’t really rev it up. I was hoping to find one where somebody is riding around town with it.