Horsepower - Keefer, Inc. Tested

FMF 4.1 Stainless Muffler System (2023 Kawasaki KX250)

The Kawasaki KX250 has undergone some significant engine changes for 2023 and that sparked FMF to make an update to their 4.1 muffler system. The 2023 Kawasaki KX250 engine character has more low end grunt as well as pulling power than last year’s model but it still isn't quite as good as the Yamaha in…

ByKris KeeferDecember 1, 20220Comments

Bike Brands Bolt-Ons KiT Performance Yamaha

Slater Skins Air Box Cover (Yamaha YZ250F/450F)

Remember Slater Skins? Yeah, the Blue Buffalo Supercross Team that had the complete signage/coverings across their bikes was John Slater’s brainchild, but most recently he has started to offer air box covers for late model YZ-F’s that increase airflow. We all know more air equals more power, but how does it relate to the track?…

ByKris KeeferOctober 19, 20200Comments

Garage KiT Trackside

VP MR-Pro 6 Racing Fuel Review

If you're on a budget and are happy with your pump fuel, just continue on with your day and don’t worry about this review. There is nothing wrong with pump fuel (unless you’re from California then you have ethanol problems). However if you do have some extra cash and want to see an improvement in…

ByKris KeeferDecember 3, 20180Comments

Bolt-Ons Exhaust KiT Performance

Yoshimura RS-9T Full Titanium/Carbon Muffler System

The 2018 Honda CRF450R is a refined version of the 2017, albeit a better one I may add. If you listened to the muffler shootout podcast you would know that this is a great muffler to add to your new Honda CR450R. If you haven't listened do yourself a favor and click on the podcast…

ByKris KeeferFebruary 5, 20180Comments

Bike Brands Exhaust KiT Performance Yamaha

Dubach Racing (DR.D) 2018 Yamaha YZ450F Slip-On Muffler

Before I start this review I am going to go on a little rant here, so bare with me. Mufflers are always a hot topic when it comes to horsepower, especially when you get a new bike. I know a lot of riders out there get a muffler system before they even ride their new…

ByKris KeeferFebruary 1, 20180Comments

Exhaust KiT Performance

FMF Factory 4.1 RCT Full Muffler System Product Review

It’s hard sometimes to get more power out of newer four-stroke models nowadays with aftermarket mufflers systems. To be honest with you most stock systems are pretty damn good and aftermarket muffler companies like FMF work really hard to try and give you that little extra bit out of a system. I can sit here…

ByKris KeeferJanuary 14, 20180Comments

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