Q: Why should I purchase an M4 exhaust system?
A: The simplest way to gain performance is with an aftermarket exhaust.
At M4 we take the time to make sure the performance gains you get are the best possible. We won't feed you unrealistic or impossible numbers. You will get a real performance exhaust system, with horsepower and torque increases all thru the RPM range.
Q: Do I need to re-jet or re-map?
A: It is not absolutely necessary to re-jet or re-map after installing a new M4 system. Your bike will run fine if you don't. In most cases, however, the ride and performance will be enhanced with optimal jetting and mapping.
Q: What kind of gains can I expect?
A: In cases where stock systems are already close to producing maximum power, a slip-on will usually provide an increase of 2 to 3 horsepower, and will give you the most bang for the buck.
Check out our dyno chart in this ad.
Q: What does a M4 exhaust sound like?
A: Well to be honest, most aftermarket systems sound pretty much the same. Some have a deep sound and some, after a few miles, have a raspy sound.
We feel our systems have a deep, mellow sound. Most systems are around 92 to 98db's.
If you run your rpm up to the rev limiter the db's may go as high as 100 to 102db's.
Q: Are M4 systems street legal?
A: No, there are no aftermarket exhaust systems that are street legal in the U.S. market. Our systems are designed for closed course racing. We will admit most aftermarket systems end up on street ridden motorcycles. We don't know of any city or state that enforces D.O.T. regulations.
CALIFORNIA CUSTOMERS WARNING: You acknowledge and agree that the selected product(s) that you are purchasing from Wicked Racing, Inc. affecting factory-installed emission equipment are intended FOR RACING USE ONLY, i.e. for use and installation on racing vehicles to be used on closed courses only, and MUST NOT be used on roads or installed on vehicles subject to emission control requirements. You agree NOT to use or install the product(s) on vehicles registered or used on California public roads. By purchasing this product you confirm that you have read and understood this Warning and you agree that you will comply with its requirements. Any use inconsistent with the above will void the manufacturer’s warranty without further notice.
Please note M4 exhausts typically ship within 3 to 5 days of order.
We are a full-line M4 dealer - we are here to help!
Please be sure to visit our eBay store for thousands of the best parts and gear for you and your motorcycle!