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Discussion Starter #1 (Edited)
MJS Headers on 2013 ZX6R

Purchased the headers off a member here and recently installed them along with a M4 GP Mount and Power Commander V (also purchased off a member on here), the fit is absolutely perfect, the install was incredibly easy I did not even have to take off the side fairings although by doing that you struggle a little to get the flanges on and tighten everything up but its do-able, the bike seems to run ALOT smoother through the entire rpm range and definitely is quicker. As for the sound....well its loud, extremely loud which is a given with the M4 GP mount with the baffle removed. If I had something to compare it to, it would be an actual MotoGP bike, just sounds racey lol, not raspy or anything just a smooth clean sound that's race bike volume. Would definitely recommend the headers to anyone looking to get race headers. If you do get them, don't get scared when you first start the bike and it stinks lol it's just the residue and dust from your oily fingers, smell went away after letting it get up to operating temp and letting it idle for about 3-4 minutes.

Here's the anticipated sound clip lol:

http://www.youtube.com/watch?v=Tv8sYEJ-ffQ :yumyum:

I'll get a fly by video later on today so you guys can hear what it sounds like throughout the entire rpm range :naughty:
 

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Sounds good I just sent a stock header to the muffler shop getting the cat cut off , then planning on getting them ceramic coated . Can't wait to hear & feel the difference.
 

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I have MJS Headers myself. Only reason why I did was to get an O2 Sensor Plug welded in. At the time, there weren't any headers that could be purchased separately or I would have went with those for sure. I'll soon make the switch over to some Arrow Headers as these headers are just stock headers without the catalytic convertor. Nothing fancy about them. The headers from MJS are actually people's headers from their bikes as core. Only difference I heard from the Cat (Meow) being removed was the exhaust seemed a tad deeper.
 

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I had a stock header modified by a muffler shop similar to the MJS Header . Iam about to install them myself any day now. Do you have any other tips or advice so I can do it right the first time. Do I need to buy new gaskets or not bike only has about 3707 miles on it.
 

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Discussion Starter #8

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Discussion Starter #9
I had a stock header modified by a muffler shop similar to the MJS Header . Iam about to install them myself any day now. Do you have any other tips or advice so I can do it right the first time. Do I need to buy new gaskets or not bike only has about 3707 miles on it.
I reused my stock gaskets but they only had maybe 50 miles on them, you should be fine though. I installed them without pulling and plastics off at all, all i did was take out the two plastic push pins in the middle of the bottom plastics so the two sides of the bike "open up" and was able to sneak the stock headers out and the MJS ones in, its tight and kind of frustrating this way but try to have an extra set of hands hold them up for you so you don't lose your gaskets while re-installing the flanges. For some reason the nuts on the stock header flanges were only on there hand tight with no thread locker on it at all which I found pretty odd. I made all the nuts snug but not over tight one I got the MJS header in place. If you do it the way I did it by just splitting the plastics at the bottom, I hope you have small hands because you'll be fighting with the flanges and nuts through the little cut out in the side fairings lol. If you have any more questions or run into any problems during the install shoot me a PM I'll be happy to help you out. :bigthumb:
 

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So wait a min, all of you guys running MJS header, has anyone gotten it tuned? You do realize it needs to be tuned as the MJS header is essentially a full exhaust...
 

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Discussion Starter #11
So wait a min, all of you guys running MJS header, has anyone gotten it tuned? You do realize it needs to be tuned as the MJS header is essentially a full exhaust...
I'm running a tune through my PCV, running the map for the full two bros from powercommander.com but I have a dyno appointment coming up for a custom dyno tune :naughty:
 

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I have MJS Headers myself. Only reason why I did was to get an O2 Sensor Plug welded in. At the time, there weren't any headers that could be purchased separately or I would have went with those for sure. I'll soon make the switch over to some Arrow Headers as these headers are just stock headers without the catalytic convertor. Nothing fancy about them. The headers from MJS are actually people's headers from their bikes as core. Only difference I heard from the Cat (Meow) being removed was the exhaust seemed a tad deeper.
I hate to burst your bubble, but there is anything "fancy" about those expensive arrow headers either... They're twice the cost of MJS headers, but you save about 3lbs and gain about 2 more hp.
 

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I hate to burst your bubble, but there is anything "fancy" about those expensive arrow headers either... They're twice the cost of MJS headers, but you save about 3lbs and gain about 2 more hp.
Every bit counts I guess. Ouch. Twice as much...why not just then get a full pipe at that point? Maybe a full M4...not to sure about the Two Brothers one, they seems a bit gilded to me but thats just my two cents. I'm sure it will come out good either way.
 

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I'm running a tune through my PCV, running the map for the full two bros from powercommander.com but I have a dyno appointment coming up for a custom dyno tune :naughty:

Good stuff you will be happy after you get it tuned.

I hate to burst your bubble, but there is anything "fancy" about those expensive arrow headers either... They're twice the cost of MJS headers, but you save about 3lbs and gain about 2 more hp.
+1 to this

I only gained two hp at the peak when switching from MJS to full akrapovic and lost a little in the mid range. Outside of the weight savings there isn't much benefit, in fact if I was riding on the street I would go with the MJS for the little extra grunt down low.
 

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Discussion Starter #15
Good stuff you will be happy after you get it tuned.



+1 to this

I only gained two hp at the peak when switching from MJS to full akrapovic and lost a little in the mid range. Outside of the weight savings there isn't much benefit, in fact if I was riding on the street I would go with the MJS for the little extra grunt down low.

+1 on that! Love that little extra umph down low, perfect for riding through NYC
 

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I reused my stock gaskets but they only had maybe 50 miles on them, you should be fine though. I installed them without pulling and plastics off at all, all i did was take out the two plastic push pins in the middle of the bottom plastics so the two sides of the bike "open up" and was able to sneak the stock headers out and the MJS ones in, its tight and kind of frustrating this way but try to have an extra set of hands hold them up for you so you don't lose your gaskets while re-installing the flanges. For some reason the nuts on the stock header flanges were only on there hand tight with no thread locker on it at all which I found pretty odd. I made all the nuts snug but not over tight one I got the MJS header in place. If you do it the way I did it by just splitting the plastics at the bottom, I hope you have small hands because you'll be fighting with the flanges and nuts through the little cut out in the side fairings lol. If you have any more questions or run into any problems during the install shoot me a PM I'll be happy to help you out. :bigthumb:
Cool thanks for the info.
 

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So wait a min, all of you guys running MJS header, has anyone gotten it tuned? You do realize it needs to be tuned as the MJS header is essentially a full exhaust...
I'm running a PCV and will be getting it Dyno Tuned in a few, I was quoted $295 for the tune.
 

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Smokey11 was your full povic Ti or SS?
I have SS, there is only 2.5 lbs difference between the SS and evo Ti and both produce the same power. I can't really justify the extra expense, also I think I negated most of the weight difference by changing my can as well.
 
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