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FMF Powercore 4 HEX Slip-On Exhaust With Side Panel
FMF Powercore 4 HEX Slip-On Exhaust With Side Panel

$ 305.99 - $ 341.99
10% Off - Save up to $38.00

Item #FMF000B

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2 Reviews
5 out of 5 stars
5 Star   2 4 Star   0 3 Star   0 2 Star   0 1 Star   0
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All Reviews
Top 500 Contributor Verified Purchaser
Durability 5/5 Ease of Installation 5/5 Performance 5/5 Power 5/5 Style 5/5
Flying Machine Factory

Slipped this on my 2016 crf450r, very easy install, love the sound not really louder which is good but a more throaty sound. Didn't notice any difference in balance between the duals and the single. I just like the look of the single..

Verified Purchaser
Durability 4/5 Ease of Installation 4/5 Performance 4/5 Power 4/5 Style 4/5

I love it great replacement from stock duels.

4 Questions
Answered:   4
Not Yet:   0
Q: Do i get 2 for my 17 crf450?
2 months 19 days ago
Top 1
2 months 19 days ago
A: No. This is a single side conversion.
Q: Is this a slip on for the stock head pipe or do you have to buy the power bomb header as well?
Over 8 months ago
Top 10
Over 8 months ago
A: This slip-on will fit your stock header no problem! If you wanted the full packaged, you would see a significant low end power gain.
Q: Which is quieter? The Powercore 4 or Q4?
Over 3 years ago
Expert MotoSport Staff
Over 3 years ago
A: The Q4 comes with the quiet core insert and would be quieter.
Q: I just bought my 2015 crf250r. can i just buy this slip on and im good to ride? or i do i have to buy complete exhaust due to stock duel?
Over 4 years ago
Top 10
Over 4 years ago
A: Yes! Just be sure to correctly select the Year/Make/Model of your bike before ordering so we can be sure to send you the correct products for your bike. Also, feel free to give us a call at 888-676-8853 and we would be happy to help you out with your order.

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# Part Numbers
Product Variant Manufacturer Part #
FMF Powercore 4 HEX Slip-On Exhaust With Side Panel 041557
FMF Powercore 4 HEX Slip-On Exhaust With Side Panel 041505
FMF Powercore 4 HEX Slip-On Exhaust With Side Panel 041521
California Proposition 65

WARNING: This product contains chemicals known to the State of California to cause cancer, and birth defects or other reproductive harm. Wash hands after handling. For more information, go to