Question about exhaust & tuner - Kawasaki KFX450 Forum :: KFX450HQ.com
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post #1 of 12 (permalink) Old 04-20-2018, 10:17 AM Thread Starter
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Question about exhaust & tuner

So I picked up a wrecked '08 KFX450R last night. It looks to have a tuner, airbox lid cutout & full Two Brothers exhaust. I need to find get in there and see what kind of tuner it is.

But my question is, when replacing the muffler (got damaged badly) can I slap any slip on on there or does it have to be another Two Brothers can? For some reason, they seem next to impossible to find so that's why I was hoping to be able to put something else on there and still get decent performance.
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post #2 of 12 (permalink) Old 04-20-2018, 10:22 AM
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It depends almost every one does it different. My Dasa is not even close to the size of my stock exhaust. But on my dirt bike I didnít want to use the FMF Header and just put the muffler on and it fit on perfect.


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post #3 of 12 (permalink) Old 04-20-2018, 10:49 AM Thread Starter
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It depends almost every one does it different. My Dasa is not even close to the size of my stock exhaust. But on my dirt bike I didnít want to use the FMF Header and just put the muffler on and it fit on perfect.


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I wasn't even considering fitment, good call. I assumed that like dirt bikes most of the slip on's were interchangeable with headers.
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post #4 of 12 (permalink) Old 04-20-2018, 10:50 AM
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Then what were you wondering about?


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post #5 of 12 (permalink) Old 04-20-2018, 12:47 PM
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The Two Brothers discontinued the slip on for the KFX450 which is why they're harder to find. A FMF Powerbomb or Megabomb header will fit with all slip on systems that don't require modifying the factory header. I have a RS2 full system for 440 shipped if you decide to go with an entirely new system. Majority of the fuel controllers are universal and only show their limitations when going with an in depth build. Be sure to toss the Swiss cheese air box for a Fuel Custom intake when possible. You'll notice a huge power difference!

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post #6 of 12 (permalink) Old 04-23-2018, 09:19 AM Thread Starter
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Then what were you wondering about?


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I was thinking about just the overall performance of mixing systems and getting poor results.

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The Two Brothers discontinued the slip on for the KFX450 which is why they're harder to find. A FMF Powerbomb or Megabomb header will fit with all slip on systems that don't require modifying the factory header. I have a RS2 full system for 440 shipped if you decide to go with an entirely new system. Majority of the fuel controllers are universal and only show their limitations when going with an in depth build. Be sure to toss the Swiss cheese air box for a Fuel Custom intake when possible. You'll notice a huge power difference!

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Thanks for the info! Are you familiar with the Two Brothers header, would they be similar to the FMF powerbomb or megabomb that will accept a slip-on? Unfortunately I won't be able to take you up on that full system as this thing needs a lot of stuff and can't spend too much on full system. I recently read about the Fuel intake, sounds impressive!
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post #7 of 12 (permalink) Old 04-23-2018, 10:09 AM
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Measure the OD of the header. Then call FMF and find the ID of the FMF mid pipe.


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post #8 of 12 (permalink) Old 04-23-2018, 10:59 AM
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Quote:
Originally Posted by platinum350 View Post
Quote:
Originally Posted by justeg450r View Post
Then what were you wondering about?


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I was thinking about just the overall performance of mixing systems and getting poor results.

Quote:
Originally Posted by KB Motorsports View Post
The Two Brothers discontinued the slip on for the KFX450 which is why they're harder to find. A FMF Powerbomb or Megabomb header will fit with all slip on systems that don't require modifying the factory header. I have a RS2 full system for 440 shipped if you decide to go with an entirely new system. Majority of the fuel controllers are universal and only show their limitations when going with an in depth build. Be sure to toss the Swiss cheese air box for a Fuel Custom intake when possible. You'll notice a huge power difference!

KB Motorsports
270-774-1982
Thanks for the info! Are you familiar with the Two Brothers header, would they be similar to the FMF powerbomb or megabomb that will accept a slip-on? Unfortunately I won't be able to take you up on that full system as this thing needs a lot of stuff and can't spend too much on full system. I recently read about the Fuel intake, sounds impressive!
I never had anyone request a Two Brother header in the past, but in general any slip on will work with the FMF headers unless the stock header had to be modified. The FCI is more impressive than any exhaust system available and performs even better with Stage II camshafts from Hotcam.
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post #9 of 12 (permalink) Old 04-23-2018, 11:39 AM Thread Starter
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I'm picking up another KFX tonight, keeping one and selling the other. I'm going to see what this one has on it and see what I can swap from one to the other then decide were to go from there. The FCI sounds like the win though. I don't think I will go to crazy with the quad, I'm a bike guy but enjoy taking out a quad from time to time. One concern is noise, where I ride I don't want whichever exhaust to be too over the top.
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post #10 of 12 (permalink) Old 05-03-2018, 09:10 AM Thread Starter
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OP back and in need of some help again. So I ended up taking the full two bros exhaust system off & replaced it with stock (wrapped) header and a Lexx slip-on. Went to start it and wouldn't start, think I ended up flooding it. Let it sit overnight and tried again this morning. Got it to start but it sounded rough, very high idle, some smoke and a lot of gas fumes. I'm assuming it's running too rich?

As it sits, it has a slip on, no airbox lid & a Power Commander 3. I'm wondering if I should just remove the PC 3?
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