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10 reviews
Fmf is still doing it
The power core 4 was a secondary choice because I could not locate a factory anodized exhaust that I was really looking for. This being said, the power core 4 has really great build quality!! I installed it on a yz250f with a power bomb header and it sounds amazing! I was skeptical about any power increase but I have to say that there is definitely a mid-too end gain with the header. Go with the mega bomb if you’re looking for bottom end gains. Overall, very pleased with the fmf system, thank you to fmf for all the years of California made quality performance exhausts!!Read full review
Verified purchase: Yes • Condition: new • Sold by: spoiledbiker
Horse power
This exhaust has a nice sound and easy to put on.
Verified purchase: Yes • Condition: new • Sold by: parts_giant
Fmf
Bought this came in like 5 days later exactly what I was looking for sound great to
Verified purchase: Yes • Condition: new • Sold by: privateermxsupply
good product
felt like it adds some bottom end, sound is great. bolts right up on my 06 yz450f
Verified purchase: Yes • Condition: new • Sold by: midwest-discoun...
Great pipe!
Adds power and reduces weight!
Made in America!
Can’t go wrong with FMF!
Verified purchase: Yes • Condition: new • Sold by: oemcycles
Great product!
Very good product and very fast delivery! Definitely will do more business!
Verified purchase: Yes • Condition: new • Sold by: midwest-discoun...
Better than stock
Better sound and performance.
Verified purchase: Yes • Condition: new • Sold by: oemcycles
Awesome
Really good exhaust
Verified purchase: Yes • Condition: new • Sold by: shopmotomentum
Excellent excellent product
Excellent product
Verified purchase: Yes • Condition: new • Sold by: oemcycles