Shopping CartCLOSE
  • Your cart is empty.
FMF Powercore 4 Complete Race Exhaust Stainless Hi-Flo Header
FMF Powercore 4 Complete Race Exhaust Stainless Hi-Flo Header

$197.99 - $224.99
10% Off - Save up to $25.00

Item #FMF001E

Read More
52 Reviews
4.8 out of 5 stars
5 Star   42 4 Star   8 3 Star   1 2 Star   1 1 Star   0
Write a Review

Write your review and you'll automatically be entered in our monthly drawing. Include an image or video to DOUBLE your chances to win!

Write Your Review Write a review to win $500
All Reviews

Will this fit a 1999 Yamaha worrior 350 and if so will it need to be re-jeted

Verified Purchaser
Reno Nevada
FMF Exhaust

I bought this FMF exhaust for my sons XR 100
I'm super impressed with the power and sound change. 100%

Verified Purchaser
Lubbock tx

I bough this a month ago for a 2013 klx 110 perfect fit great bottom end power boost and great sound

Verified Purchaser
Best decision of my life

This thing will add 69 horsepower to your minibike of choice making it into a bitchin performance machine

Verified Purchaser Top 100
Beautiful finish And look

Pipe performs very well and in my opinion is built better than pro circuit ...

Mankato MN
So awesome

If I buy this FMF Powercore 4 will I need a new heat blocker so it can fit

Verified Purchaser
Good quality

Got this for my 01 xr100 and put it on myself. I do notice some lag when just revving it (like hesitation) and I was advised it may need carb tuning after installation. I have yet to get that done. But, going up a steep hill in first or second or popping a wheely my XR has more power than with the stock exhaust and sounds louder and better. Overall, I'm pleased with my purchase and would recommend this exhaust

New Port Richey fl
2016 Yamaha ttr125l

Just ordered it my first time on this website and absolutely love what Motosport has and for great prices !! I wanted the fmf factory 4.1 but wasn’t in stock all I need now is a few motosport decals and a muffler plug !! and will be
ready to ride again thankyou Motosport you’ll be gettin lots of business coming your way !!! Thanks again motosport!

Verified Purchaser
Key West ,Fl
All around great

I got this awesome pipe awhile ago. It sounds beast as **** and I noticed a big difference in mid range power and topend as well. And let me add this is my 9yo sons bike and it’s a blast now thanks MOTO sport all around great product.

Verified Purchaser
Elyria, OH 44035, USA
Best pipe ever

I got my powercore 4 from motorsport in perfect condition...on time too....very pleased with the pipe added lots of power to my crf100...especially on the bottom

See 10 More Reviews
96 Questions
Answered:   89
Not Yet:   7
Q: Does it fit a 2007 yamaha ttr 125E
19 days ago
Top 25
19 days ago
A: Yes, it will fit as long as the 2007 TTR125 has been profiled correctly on
Q: What mm is this
1 month 4 days ago
Top 10
1 month 4 days ago
A: The FMF Powercore 4 Complete Race Exhaust Stainless Hi-Flo Header is model-specific, and the dimensions vary depending on which bike it is made to fit. The fittings are the same sizes as the original exhaust parts from each particular manufacturer.
To help us to find parts to fit correctly, we will need to know the year, make, and model of your motorcycle.
Q: I have a '99 xr100r, would this exhaust fit no problem or am I going to have to modify a few things to make it bolt on correctly?
2 months 13 days ago
Q: Will this fit 2012 Yamaha ttr 125?
3 months 20 days ago
Top 100
3 months 20 days ago
A: Yes this item will fit a 2012 Yamaha TTR125L.
Q: Will this muffler fit a Yamaha TTR125L
3 months 28 days ago
Top 1
3 months 28 days ago
A: This will work on 00-19 TTR125L bikes.
Motor Boi
Q: If you install it do you have to do a carb rejet or is it fine without?
4 months 24 days ago
Q: I am planning to get this for my son’s klx110 which would be better this or the yoshimura rs-2. Also would the bike have to be jetted again?
Over 5 months ago
Trevor Gearhead
Top 10
Over 5 months ago
A: This does not come with a spark arrestor which can limit you to closed courses in some parts of the country. The Yoshimura does. You may or may not have to rejet. It wold probably run better if you did.
Q: Mines an 87' xr100r Honda dirt bike.. Will this fit straight in without any complications?
Over 6 months ago
Top 10
Over 6 months ago
A: Correct it is a bolt on application.
Q: Will this fit on my 2006 TTR 125?
Over 7 months ago
Top 10
Over 7 months ago
A: Yes, this will fit a 2006 Yamaha TTR125. Be sure to have your bike profiled into the website to make sure you get the right part.
Q: I have an 2003 Honda XR100, will this fit my son’s bike? 
Over 10 months ago
Top 10
Over 10 months ago
A: This will fit your son's XR 100. Be sure to have the correct bike profiled into the site, so you can make sure you are getting the right part.
1 - 10 of 96

See all bikes that this part fits...

See Fitments
# Part Numbers
Product Variant Manufacturer Part #
Aluminum 042002
Aluminum 044136
Aluminum 041014
Aluminum 041016
Aluminum 040083
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

Added to your cart