It helped to mellow out the bottom end to allow it to flow through trails with easy but really did help out the mid to top end power on my Yz250fx
FMF Powercore 4 HEX Slip-On Exhaust
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Installed the Q4 on my '15 WR450F and it fires up like a champ now that I've installed the Q4 and ECU.
Installation was pretty straightforward but I would suggest loosening the header to make fitting easier.
Using the stock header required use of a coupler that FMF provided and it took a couple taps of a mallet to slide onto the header properly.
Good sound, a little more power, and smoother running. I'd definitely recommend this to anyone.
I installed this on my 2017 WR250F and absolutely love it. Very easy installation. It took me less than 20 minutes to remove my stock exhaust and install the new FMF exhaust on my bike. It sounds great and added a nice horsepower boost.
Great product. Some might think it's too loud but I think it's perfect. It makes my CRF250L feel like a new bike.
I put this exhaust on my 08 kx it sound great. Performs very well over all great muffler for the price
After removing the stock gasket between the header and the stock slip on it fit like a glove! It sounds great and looks awesome
It doesn't have a clamp to secure it so i highly recomend using hightemp silicon
I added a Powercore 4 to an 2007 400EX and it turned that thing into a whole new machine! Incredible torque and a lot of added top end pull, I would for sure recommend this to anybody looking for their first power add on to any four stroke machine if you are on a budget!
Didn't really need more power out of my yz450 just wanted to hear my bike haha, I'm running a stock map with slipon and all is well , I could probably get more power by having the bike mapped obviously
Great add on for the price if a spark arrestor is needed. Works great on my 2016 yz450.
very nice, easy to install, that along with Powerbomb header made all the difference in the world.If you are looking for more power, this is easy way to gain a little ho, seems like bike can breath, I have two identical bikes, crf250l, one with FMF one without, big difference, one without will be getting the FMF soon!
I've purchased the FMF Powercore 4 for all my other dirt bikes as well. Sounds like a beast... (re- jetting is necessary. A/F mix: pops if it's lean and surges when it's rich.)
Easy install and good fit
Went from stock exhaust on my '14 WR450f to this + the FMF Power bomb. Bike sounds amazing now. Noticed a nice low end power pickup as well.