There is a "quick fix" and it sounds awesome in my opinion and changed my mind about buying a aftermarket exhaust, some may say dodgy, but I though why not before I dropped $1000 on a exhaust. Start with 3 holes because mine is pretty loud, these holes simply bypass one of the silencing chambers inside the muffler, you can also drill a 25mm hole through the bend inside the end of the exhaust but I didn't have a long and sharp drill it because stainless is tough to drill through.
This is the inside of the muffler copied from someone else, so you can see where it's being drilled into.
That's not "dodgy" it's ghetto. Allowing exhaust gas to escape from two different places means that the bike now has two different backpressures. There is no way to tune that properly..and it would sound like crap anyway. Slip ons are $400.00 to $500.00. If you can come up with that little bit...then you probably can't afford gear either.
The bike runs fine, sounds fine and you can't get slip on exhausts for the mt07 without cutting the stock headers up. I don't know how the bike can have 2 different back pressures wouldn't it just reduce overall back pressure?
Just an idea anyway till I decide to get a nice akropovic or something.
Yes it's ghetto but doesn't bother me
If you drill those holes like in the pics...you already ruined the exhaust...so what's the difference if you cut the stock headers to add a slip on? Ruined is ruined right? I don't mind much if you want to ghetto a brand new bike...it's your bike and you're money.....but it sure as hell doesn't "run fine". You lost 3 or 4 hp doing that.
A couple years ago Cycle World had an excellent article on Airbox volume and shape and exhaust volume and shape. Basically it was in response to someone who wrote in asking about changing their airbox and muffler to get rid of weight and excess "back pressure". Cycle World did a great job of explaining what airboxes and mufflers were built the way they were and what physics were involved in the process. There are some very complicated sound/pressure waves that are sent into the combustion chamber and intake/exhaust tracts that work with the cam timing to ensure the new charge comes in at just the right time and doesn't leave until it's spent. Because the valve train doesn't open or close at TDC but both before and after, the design of everything in the intake and exhaust system work to make the best use of the volume coming in to the combustion chamber and then headed out of it. Any change to either the airbox or muffler will have an effect on the overall system. Box Stock, in any well designed system means that all in all the performance will be best for the intended use. That's why until you have done a complete dyno run before and after and changes, you really have no idea how much and where you affected performance. Sound will fool the brain into thinking it's better.
Alright so sorry to disappoint The mustang and Bob but this mod is great not only does it make the bike sound better it completely gets rid of the jerky throttle that my 2015 came with. Now I get power from the millisecond that I turn the throttle and it progresses smoothly the more I turn instead of the tiered system that I had before that made shifting a pain and was making it harder to use the bike as a new rider. Dealing with that dead spot is a thing of the past now and it's accompanied by wonderful sound so I can hold off on buying a full system for a bit since my account is feeling the pinch from the bike, the full set of gear including leather pants, jacket, snell certified helmet, gloves, shin high race boots and of course the $220 MSF course fee which I passed with 0 points deducted and the teacher offering to recommend me for a teaching position. As someone who went to automotive school I normally would agree with you about modifications like this being bad but do to the fact the exhaust is dangerously quiet (To the point that my dog who is scared of loud noises just looked at it funny instead of going inside and bicyclists don't even seem to notice me coming) I decided after looking at the internal design of the muffler that this was worth a shot. I highly recommend this modification over the R6 throttle tube swap if someone is a new rider and riding the FZ-07 because this eliminates the jerky throttle without decreasing the amount of twist needed to reach full throttle.
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