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Old 11-18-2012, 11:50 AM   #1
usmc412
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M4 gp slip on + Mjs mid pipe fitment issue

Whats up guys..

So i hacked off my cat on my k8 Gsxr 600 and installed the mjs mid pipe. Only issue is that the end of the midpipe doesn't fit snug with the m4 slip on and there is a lot of wiggle room. Has anyone had this problem? Does anyone know how I could fix the issue? Thanks
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Old 11-26-2012, 01:00 AM   #2
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Re: M4 gp slip on + Mjs mid pipe fitment issue

You're probably missing the gasket piece that was on the cat where the stock muffler slid onto the cat. Take a look at the cat and you should see a metallic type sleeve about 2" long on the end of it. Remove it, slide it on the MJS pipe. Done dollar.

Last edited by GlobeWarmer; 11-26-2012 at 01:09 AM.
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Old 11-26-2012, 07:23 AM   #3
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Re: M4 gp slip on + Mjs mid pipe fitment issue

If I read it correctly the O.D on the midpipe is smaller than the I.D on the exhaust can. Depending on how much smaller it is you may be able to have the end on the midpipe expanded at an exhaust shop to fit the exhaust can.
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Old 11-26-2012, 11:04 AM   #4
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Re: M4 gp slip on + Mjs mid pipe fitment issue

Be very careful expanding the midpipe. You can not shrink it if it expanded too far.. Most of the stainless they use on motorcycle exhaust systems will break very easily with the hydraulic machines they use to bend/expand/shrink the exhaust pipe for cars.
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Old 11-26-2012, 11:44 AM   #5
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Re: M4 gp slip on + Mjs mid pipe fitment issue

If the midpipe is for his model year, and the slip-on is for his model year then there shouldn't be a need to expand it. I'd almost guarantee it's the gasket sleeve thingy.

This is from the service manual -

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Old 11-26-2012, 01:35 PM   #6
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Re: M4 gp slip on + Mjs mid pipe fitment issue

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Originally Posted by GlobeWarmer View Post
If the midpipe is for his model year, and the slip-on is for his model year then there shouldn't be a need to expand it. I'd almost guarantee it's the gasket sleeve thingy.

This is from the service manual -

He is talking about the can end not the cat end or at lead that is how I read it he made it sound like the cat side is fine the can side is loose
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Old 11-26-2012, 02:09 PM   #7
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Re: M4 gp slip on + Mjs mid pipe fitment issue

I'm confused now too. That picture I think shows what he is talking about cuz he did the cat hack, so instead of the cat being there it's now the MJS pipe, and the M4 can is not sitting solid on it, it has wiggle room - which when I did my MJS pipe and R-55 can, was because I forgot to transfer the sleeve (seen above) from the cat's pipe to the MJS pipe. Mufflers slide over the tip of the cat's pipe (or midpipe) but the sleeve piece is needed as a gasket to provide a proper seal - without it exhaust it leaks, and it gives too much wiggle room. This has already taken up too much of my brain power!

Either way, seems like the OP figured it out or doesn't care anymore...
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Old 11-26-2012, 05:05 PM   #8
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Re: M4 gp slip on + Mjs mid pipe fitment issue

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I'm confused now too. That picture I think shows what he is talking about cuz he did the cat hack, so instead of the cat being there it's now the MJS pipe, and the M4 can is not sitting solid on it, it has wiggle room - which when I did my MJS pipe and R-55 can, was because I forgot to transfer the sleeve (seen above) from the cat's pipe to the MJS pipe. Mufflers slide over the tip of the cat's pipe (or midpipe) but the sleeve piece is needed as a gasket to provide a proper seal - without it exhaust it leaks, and it gives too much wiggle room. This has already taken up too much of my brain power!

Either way, seems like the OP figured it out or doesn't care anymore...
Ah I see why you are saying the can was made to go onto the cat but he cut the cat out so the I.D of the can is the O.D of the cat + bushing so yea he should put the bushing on midpipe and call it good
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Old 04-12-2013, 10:13 PM   #9
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Re: M4 gp slip on + Mjs mid pipe fitment issue

just picked up a 600 about a month ago and have the m4 gp slip on. looking in doing the same with mjs mid pipe. the m4 i found is loud and am looking into going louder just not sure how loud the mid pipe will make it
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Old 03-12-2014, 10:42 AM   #10
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Re: M4 gp slip on + Mjs mid pipe fitment issue

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just picked up a 600 about a month ago and have the m4 gp slip on. looking in doing the same with mjs mid pipe. the m4 i found is loud and am looking into going louder just not sure how loud the mid pipe will make it
Very loud... Definitely need ear plugs on long rides
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Old 03-12-2014, 09:17 PM   #11
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Re: M4 gp slip on + Mjs mid pipe fitment issue

Sorry for the late replies but I have ran into another issue. When I made the cut I cut as close to/on the weld but it is still not enough pipe for the mid pipe to fit without a space. I am gonna try and use some gasket sealant or jb weld to fix this hole. I will let you know how if goes.
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Old 03-12-2014, 09:35 PM   #12
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Re: M4 gp slip on + Mjs mid pipe fitment issue

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Originally Posted by usmc412 View Post
Sorry for the late replies but I have ran into another issue. When I made the cut I cut as close to/on the weld but it is still not enough pipe for the mid pipe to fit without a space. I am gonna try and use some gasket sealant or jb weld to fix this hole. I will let you know how if goes.
Really?

A highly advanced machine built to exacting tolerances and your going to JB Weld it?

Dude... you hacked it. Fix it properly.
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Old 03-12-2014, 09:39 PM   #13
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Re: M4 gp slip on + Mjs mid pipe fitment issue

Hmmmmmm. Find a welder. Post pic of the issue.
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Old 03-12-2014, 10:52 PM   #14
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Re: M4 gp slip on + Mjs mid pipe fitment issue

Post pictures please. Hell maybe even a video.


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Old 03-12-2014, 11:07 PM   #15
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Re: M4 gp slip on + Mjs mid pipe fitment issue

As you can tell by some of the responses your JB Weld idea is stupid. Your a marine right? Would you use JB Weld if you lost the pivot pin that held your bolt carrier group together? That totally stupid right? So is your idea.
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Old 03-12-2014, 11:53 PM   #16
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Re: M4 gp slip on + Mjs mid pipe fitment issue

This issue/thread really start in 11/12? Oh my!!! Where are you located maby somebody could recomend a fab shop.
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Old 03-13-2014, 07:48 AM   #17
usmc412
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Re: M4 gp slip on + Mjs mid pipe fitment issue

I'm taking it to the shop to get it welded. I can try and get pics but the hole might be too small to show up. The stock bushing that was on the cat is across the country so I'm getting it sent to me.
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Old 03-13-2014, 07:50 AM   #18
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Re: M4 gp slip on + Mjs mid pipe fitment issue

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Originally Posted by VooDoo Child View Post
As you can tell by some of the responses your JB Weld idea is stupid. Your a marine right? Would you use JB Weld if you lost the pivot pin that held your bolt carrier group together? That totally stupid right? So is your idea.
I'm a busy guy constantly on the move plus this issue is new to me so I'm doing my research and asking for opinions and advice. I don't need some snoody remark from someone like you.
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Old 03-13-2014, 11:51 PM   #19
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Re: M4 gp slip on + Mjs mid pipe fitment issue

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Originally Posted by usmc412 View Post
I'm a busy guy constantly on the move plus this issue is new to me so I'm doing my research and asking for opinions and advice. I don't need some snoody remark from someone like you.
I was trying to relate a high precision machine that your new to to a high precision weapon that you should know well so you could see where people are coming from.

Your mighty sensitive.

RLTW
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Old 03-14-2014, 06:44 AM   #20
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Re: M4 gp slip on + Mjs mid pipe fitment issue

I gotcha. Well the dude at the shop said I have two options... A wrap with some clamps for the cheap way or removing the entire system and welding it. I'm probably gonna go with option two, but I will take some pics when I get it off this weekend so anyone who is going the mid pipe route has a idea of what not to do and how close to the cat you actually have to cut.
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