Power Commander & exhaust - Kawasaki KFX450 Forum :: KFX450HQ.com
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post #1 of 6 (permalink) Old 04-21-2018, 03:19 PM Thread Starter
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Power Commander & exhaust

Fellas, just picked up an '08 KFX but the muffler cracked and I need to replace it. It appears to be a full Two Brothers exhaust, has a paper filter and I see a Power Commander 3 controller. I don't know if anything else was done internally.

What I need help with is replacing the muffler, I know nothing about the commander. I found a used Lexx muffler with a wrapped OEM header. Does anyone know if I could just slap the Lexx muffler onto the 2bros header and call it a day?
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post #2 of 6 (permalink) Old 04-21-2018, 05:53 PM
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A Full exhaust system are not interchangeable with other exhaust brands, Due to the Pipes diameter & bends...So NO...!

The Lexx muffler is a slip-on designed for the OEM Header...!!
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post #3 of 6 (permalink) Old 04-21-2018, 06:58 PM Thread Starter
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Quote:
Originally Posted by Dust Devil View Post
A Full exhaust system are not interchangeable with other exhaust brands, Due to the Pipes diameter & bends...So NO...!

The Lexx muffler is a slip-on designed for the OEM Header...!!
Ok got it, thanks. One more question for you. I have two options:
1) buy used Lexx & stock header and run with programmer
2) spend a lot more and buy a new 2 Bros muffler for $300 😞

If I go with option 1, would I need to reprogram Power Commander?
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post #4 of 6 (permalink) Old 04-21-2018, 08:54 PM
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Quote:
Originally Posted by platinum350 View Post
Quote:
Originally Posted by Dust Devil View Post
A Full exhaust system are not interchangeable with other exhaust brands, Due to the Pipes diameter & bends...So NO...!

The Lexx muffler is a slip-on designed for the OEM Header...!!
Ok got it, thanks. One more question for you. I have two options:
1) buy used Lexx & stock header and run with programmer
2) spend a lot more and buy a new 2 Bros muffler for $300 😞

If I go with option 1, would I need to reprogram Power Commander?
Yes..PCIII will need to be adjusted due to amount of back pressure difference in the exhaust system you choose...

What air intake tube is on your quad...OEM or after market...??

See picture example...Stock vs LTR..Stock vs FCI...
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ID:	23498   Click image for larger version

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ID:	23506  

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[email protected]
Save 5% off $100 or more, use coupon code: KFX450HQ

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Website:
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Last edited by Dust Devil; 04-21-2018 at 08:57 PM.
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post #5 of 6 (permalink) Old 04-23-2018, 09:59 AM Thread Starter
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Quote:
Originally Posted by Dust Devil View Post
Quote:
Originally Posted by platinum350 View Post
Quote:
Originally Posted by Dust Devil View Post
A Full exhaust system are not interchangeable with other exhaust brands, Due to the Pipes diameter & bends...So NO...!

The Lexx muffler is a slip-on designed for the OEM Header...!!
Ok got it, thanks. One more question for you. I have two options:
1) buy used Lexx & stock header and run with programmer
2) spend a lot more and buy a new 2 Bros muffler for $300 😞

If I go with option 1, would I need to reprogram Power Commander?
Yes..PCIII will need to be adjusted due to amount of back pressure difference in the exhaust system you choose...

What air intake tube is on your quad...OEM or after market...??

See picture example...Stock vs LTR..Stock vs FCI...
In the first picture, the stock intake is on the right, correct? That's the one that is on there. I noticed there is a Pro Designs metal flange in the airbox where the K&N filter attaches too. Everything else seems stock.
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post #6 of 6 (permalink) Old 04-23-2018, 11:04 AM
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Quote:
Originally Posted by platinum350 View Post
Quote:
Originally Posted by Dust Devil View Post
A Full exhaust system are not interchangeable with other exhaust brands, Due to the Pipes diameter & bends...So NO...!

The Lexx muffler is a slip-on designed for the OEM Header...!!
Ok got it, thanks. One more question for you. I have two options:
1) buy used Lexx & stock header and run with programmer
2) spend a lot more and buy a new 2 Bros muffler for $300 😞

If I go with option 1, would I need to reprogram Power Commander?

I didn't realize you had a Full Two Brothers exhaust in your other thread, so disregard the information I posted earlier. Do not spend an extra 300 to repair your two brother system when you can get a better exhaust for 130 more, and avoid option one unless performance isn't a concern. You may or may not need a new fuel map, and no one will know until the new setup is tested.
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