Exhaust

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DR.D Stainless Full Muffler System

By: Michael Allen And Kris Keefer It’s no secret that Doug Dubach knows Yamahas. That being said, after years of testing for Yamaha Doug started Dubach Racing Development where he builds finely tuned exhaust systems for other major motocross models. However, this isn’t one of those “other” motorcycles and we wanted to take that atrocious…

ByKris KeeferJanuary 14, 20210Comments

Bolt-Ons Exhaust KiT Performance

Twisted Development Performance Exhaust Flange

Looking for more throttle response as well as increased pulling power out of corners on your KTM 450SX-F? Although I love that smooth engine character on the KTM, I could stand to get a little more throttle response and excitement from the orange machine as well. Jamie from Twisted Development and I went through several…

ByKris KeeferOctober 23, 20200Comments

Bike Brands Bolt-Ons Exhaust Kawasaki KiT Performance

Pro Circuit Ti-6 Muffler System (2021 Kawasaki KX250)

Over 300 part number changes have been made on the 2021 Kawasaki KX250. After our first day on the new KX250 I was quite impressed with its ability to pull hard out of the corner and rev out longer than last year’s model. However, even though the Kawasaki has improved for 2021, the muffler still…

ByKris KeeferOctober 15, 20200Comments

Bike Brands Bolt-Ons Exhaust Kawasaki KiT Performance

How To Save Your Subframe On Your 2019-2021 Kawasaki KX450

By: Matt Sirevaag (AKA Vaaaaaaag) You just took ownership of a new KX450 and you want to change the engine characteristic with a new exhaust. However when listening to Keefer rant on the Pulp MX Show about A-Ray giving away mufflers like he’s Oprah on a Christmas special has you hesitant. You may wonder why…

ByKris KeeferOctober 8, 20200Comments

Bike Brands Bolt-Ons Exhaust KiT Performance Suzuki

2020 FMF Factory RCT 4.1 Stainless Full System (Suzuki RM-Z450)

FMF has helped us on many builds and you may be wondering why do we use them so much? Well… A couple reasons are because FMF is a great American made company, they are easily accessible to us dumb media people and they actually care about the results of their product. If for whatever reason…

ByKris KeeferJune 25, 20200Comments

Bike Brands Bolt-Ons Exhaust Honda KiT Performance

Yoshimura RS-9T Stainless Full System (2020 Honda CRF250R)

The 2020 Honda CRF250R is much better off the bottom end than the 2018-2019 versions, but we wanted to test the latest full stainless Yoshimura RS-9T to see if it helped the stock Honda’s engine character at all. We were specifically looking for a little more RPM response and pulling power because the Honda is…

ByKris KeeferJune 10, 20200Comments

Bike Brands Bolt-Ons Exhaust Honda KiT Performance

2020 Honda CRF450R Three Way Muffler System Comparison

The 2020 Honda CRF450R is a popular machine. After all of my years with Dirt Rider Magazine as well as doing my own thing over here at Keefer Inc. Testing there has been one thing that hasn't changed… The amount of page views and questions that I get about the Honda are always more than…

ByKris KeeferApril 5, 20200Comments

Bolt-Ons Exhaust KiT Performance

FMF 4.1 Full System Vs. Akrapovic Evolution Full System Vs. Akrapovic Slip On

We recently received the 2020.5 KTM 450 SX-F Factory Edition and after dissecting it for a few weeks, we thought we would test a couple different muffler systems on it. We wanted to see if we could improve upon the KTM Factory Edition’s delivery. The KTM comes with an Akrapovic slip on we thought since…

ByKris KeeferMarch 16, 20200Comments

Bike Brands Bolt-Ons Exhaust KiT Performance Yamaha

Yamaha YZ125 Pipe/Silencer Comparison (Pro Circuit Vs. FMF)

For over 10 years the YZ125 engine has remained the same. At one time it was the best 125cc engine around, but in recent years that award has gone to KTM/Husqvarna. KTM and Husqvarna’s latest 125cc engines have a wider powerband and is simply more exciting everywhere on the track. Compared to the KTM and…

ByKris KeeferJanuary 30, 20200Comments

Bike Brands Bolt-Ons Exhaust KiT Performance Yamaha

FMF 4.1 RCT Stainless Muffler System For 2020 YZ250F

Written/Tested By: Michael Allen It’s no secret that the YZ250F is one of, if not the best 250F in the class for 2020. One of the things that makes the YZ stand out is the raw amount of torque it produces compared to the other bikes in the class. Some of the other bikes may…

ByMichael AllenDecember 16, 20190Comments

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