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FMF

1 1/8 in. PowerCore 4 Quiet Core Insert - 040630

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FMF

1 1/8 in. PowerCore 4 Quiet Core Insert - 040630

MSRP Price: $39.99

Our Price: $35.99
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1 8 HR : 4 5 MIN : 4 5 SEC
FMF 1 1/8 in. PowerCore 4 Quiet Core Insert - 040630
  • Replacement 1-1/8 in. quiet core insert for PowerCore 4 (except minis)
Specifications
Part #: 435531
Mfg #: 040630
System PowerCore 4
Type Insert
Type Silencer Insert
Units Each
Weight 0.35 lbs
Alternate/OEM Part Number(s):
18610697
WARNING: Cancer and Reproductive Harm - www.P65Warnings.ca.gov
Reviews & Questions
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Browse 2 questions Browse 2 questions and 4 answers
Does it fit on my fmf powercore 4??
A shopper on Mar 15, 2018
BEST ANSWER: This will fit an fmf powercore 4, however there are different models of that slip on. I suggest going to FMFs website to be sure this is the one you need.
Will this fit my FMF Carbonfiber apex on my 2013 CBR250r? The core screw vibrated loose while riding, and I lost the tube... it sounds like a pissed off dirtbike now...
Pat P on Sep 19, 2016
BEST ANSWER: This is for a PowerCore 4 dirtbike exhaust, it will not work in an Apex Street exhaust, I would contact FMF directly with your issue to see if they can provide you what you need.

http://www.fmfracing.com/Info/Contact
4.3 / 5.0
6 Reviews
5 Stars
4 Stars
3 Stars
2 Stars
1 Star
2
4
0
0
0
Finish
4.0 / 5
Fit
3.0 / 5
Quality
4.6 / 5
Style
4.5 / 5
Value
4.4 / 5
Would you recommend this product?
Yes (1)
Fit
5 / 5
Quality
5 / 5
Style
4 / 5
Value
5 / 5
Quite your fmf exhaust
Definately makes the power core much quiter without significantly impacting performance.
August 31, 2012
Works as intended
This is a quiet insert that works very well. I did notice a slight loss of top end power, but that may honestly be a perception due to the fact that it is quieter and therefore seems like less power. A dyno is the only way to really tell, another plus is I seemed to gain a little on the bottom end. I noticed a significant decrease in noise, but it still has a good sound. It's not whisper quiet, I don't want it that way. But it's no longer ear-splitting either which is a really good thing. I definitely recommend if you care about helping to keep our riding areas open.
May 31, 2016
Chula, MO
Finish
4 / 5
Fit
3 / 5
Quality
4 / 5
Value
4 / 5
Would you recommend this product?
Yes
nicely quiet!
The screw is a freaking pain in the butt to get in! I bled doing it but once in it is beautifully quiet and I pass tech now... Made my powerband more linear / electric feeling. Quiet bikes are good bikes.
November 1, 2016
WI
Purchased
over 2 years ago
Fit
2 / 5
Quality
5 / 5
Style
5 / 5
Value
5 / 5
FMF Quiet Core Insert
So the item works as advertised once installed. The only issue I had was that the retaining screw they provde with the insert is not the same pitch as the one that comes with the exhaust and original spark spark arrestor
. The original screw that comes with the exhaust cant be used with the Quiet Core insert as its not long enough. I had to go to the hardware store and find a correct pitch/length screw. Then when I went to install, I and several others attempted this I might add, we could not get the screw to go into the hole in the exhaust while the inert was installed. It threads in when the insert is out so I know its the correct pitch and size. There is very little room to work (1 1/8") and impossible to see if the 2 holes are lined up. I even over sized the hole in the core and still couldn't get it to align. I finally went and purchased some non expanding high heat silicone and glued it in. If you don't use the screw or adhesive it will eventually blow out due to back pressure.
May 11, 2016
Purchased
over 3 years ago
Fit
4 / 5
Quality
5 / 5
Style
5 / 5
Value
4 / 5
Worth it
This seems to work pretty effectively at part throttle on my WR250R, but when you goose it there is still a pretty good bark from the exhaust. No noticeable power loss compared to std Q4 insert.
April 6, 2016
Fit
1 / 5
Quality
4 / 5
Style
4 / 5
Value
4 / 5
No Review Title Entered By User
I enjoy the powercore4 for my KTM 990 SMR (street bike) but found them way to loud for my taste and for the MIBS; so I purchased these dB-killers; fit is garbage, baffles aren't touching all around the cone cap and each of them was delivered with a different screw.!
But, God now the sound is exactly what I hopped for: much quieter than equiped with their stock sparks arrestors but keeping its enjoying bass groove; it is now just a few dB louder (maybe 3 or 4) than my stock KTM exhausts wich are catalised. Ice on the cake: my bike is smoother at low rpm than with the stock ktm exhauts and almost (if as much) as powerfull on the global rpm range than the powercore4 with spark-arrestors. I'm very happy!
March 19, 2014