M4 GP slip on with MJS headers - Yamaha R6 Forum: YZF-R6 Forums
 
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post #1 of 7 (permalink) Old 11-17-2016, 04:41 PM Thread Starter
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Cool M4 GP slip on with MJS headers

Hey ya'll, I have read a thread about this before but have another question about it, I am planning on doing the MJS headers with an M4 GP slip on, I have read it can cause backpressue issues because of the shortness of the slip on, my question is if I were to use a PC5 and get my bike dyno'ed would it fix any backpressure issues??

Thanks for the help
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post #2 of 7 (permalink) Old 11-17-2016, 07:59 PM
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Re: M4 GP slip on with MJS headers

Welcome.
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It will be loud AF, but a good PC5 map will help clear up any A/F issues from the exhaust changes.

2009 Yamaha R6 Raven, BAUCE ECU flash, K&N filter, Agg Racing block-offs, M4 mid-pipe w/Yoshi Ti TRC can, Galfer lines, EBC HH front pads, Zero Gravity DB, DDM HIDs, Hotbodies smoked flushmounts, Lockhart Phillips smoked integrated tail, TST Industries Elite-1 fender kit

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post #3 of 7 (permalink) Old 11-17-2016, 11:53 PM
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Re: M4 GP slip on with MJS headers

I recently just had mjs mid + gytr slip on installed. It'll be similar to your setup.

The back pressure will be different of course due to the honeycomb removed and cat removed.

What I know is that PC5 will help you if you have a good map. I went with FlashTune ECU and dyno tune it.

Got around 110 HP. No idling issues at all.

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MJS Mid + GYTR Slip-on
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post #4 of 7 (permalink) Old 11-18-2016, 06:27 AM
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Re: M4 GP slip on with MJS headers

Get your ECU reflashed or go the PCV/tune route. I did both..

Mods: Bauce Racing ECU Flash, PCV, Custom Dyno Tune, MJS Mid-Pipe, Graves Carbon Fiber Slip-On, Graves Smog Block Off Plates, Graves Bar Ends, Zero Gravity Double Bubble Windscreen, Woodcraft Front & Rear Axle Sliders, Woodcraft Cut Frame Sliders, Woodcraft Slider Spools, T-Rex Clutch Sliders, K&N Air Filter, Fender Eliminator, Motodynamic Integrated Taillight, Hot Bodies Flush Mount Turn Signals & Pazzo Levers.
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post #5 of 7 (permalink) Old 11-18-2016, 01:26 PM Thread Starter
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Re: M4 GP slip on with MJS headers

Awesome! Thanks for the feedback guys looks like i got some parts to order!
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post #6 of 7 (permalink) Old 01-31-2017, 06:31 PM
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Re: M4 GP slip on with MJS headers

I have the mjs with the M4 street slayer which is also very short.. I had no probelms with the bike at all.
but it as loud as they can get.
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post #7 of 7 (permalink) Old 01-31-2017, 06:35 PM
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Re: M4 GP slip on with MJS headers

I had a MJS with GYTR slip-on. It was too loud for me so I'm selling the MJS headers now.

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